Low-Voltage, 8-Channel/Dual 4-Channel Multiplexers with Latchable Inputs

Transcription

1 9-396; Rev. ; 5/95 Low-Voltage, 8-Channel/Dual 4-Channel General Description The are low-voltage, CMOS, -of-8 and dual 4-channel muxes with latchable digital inputs. They feature low-voltage operation from a +2.7V to +6.5V single supply and from ±3V to ±8V dual supplies. Pin compatible with the DG428/DG429, these muxes offer low on-resistance ( max) matched to within 4 max between channels. Additional features include off leakage less than 2.5nA at +85 C and guaranteed low charge injection (pc max). ESD protection is greater than 2V per Method Applicatio Battery-Operated Systems Audio Signal Routing Low-Voltage Data-Acquisition Systems Sample-and-Hold Circuits Automatic Test Equipment Features Pin-Compatible with Industry-Standard DG428/DG429, DG528/DG529, MAX368/MAX369 Single-Supply Operation (+2.7V to +6.5V) Bipolar Supply Operation (±3V to ±8V) Low Power Coumption (<3µW) Low On-Resistance, max Guaranteed On-Resistance Match Between Channels, 4 max Low Leakage, 2.5nA at +85 C TTL/CMOS-Logic Compatible Ordering Information PART TEMP. RANGE PIN-PACKAGE CPN CWN C/D C to +7 C C to +7 C C to +7 C 8 Plastic DIP 8 Wide SO Dice* EPN -4 C to +85 C 8 Plastic DIP EWN -4 C to +85 C 8 Wide SO EJN -4 C to +85 C 8 CERDIP** MJN -55 C to +25 C 8 CERDIP** Ordering Information continued on last page. * Contact factory for dice specificatio. ** Contact factory for package availability. Pin Configuratio TOP VIEW 8 8 A N 5 N2 6 N3 7 N4 9 LOGIC 7 A 6 A N5 2 N6 8 N7 DIP/SO N8 A NA 5 N2A 6 N3A 7 N4A A 9 LOGIC 7 A NB 3 N2B 2 N3B 8 N4B DIP/SO B Maxim Integrated Products Call toll free for free samples or literature.

2 ABSOLUTE MAXIMUM RATINGS Voltage Referenced to...-.3v to +7V...+.3V to -7V to...-.3v to +7V Voltage into Any Terminal (Note )...( - 2V) to ( + 2V) or 3mA (whichever occurs first) Current into Any Terminal...3mA Peak Current, Any Terminal (pulsed at ms, % duty cycle max)...ma Continuous Power Dissipation (T A = +7 C) Plastic DIP (derate.mw/ C above +7 C)...889mW Wide SO (derate 9.52mW/ C above +7 C)...762mW CERDIP (derate.53mw/ C above +7 C)...842mW Operating Temperature Ranges MAX38_C_ N... C to +7 C MAX38_E_ N...-4 C to +85 C MAX38_MJN C to +25 C Storage Temperature Range C to +5 C Lead Temperature (soldering, sec)...+3 C Note : Signals on any terminal exceeding or are clamped by internal diodes. Limit forward current to maximum current ratings. Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditio beyond those indicated in the operational sectio of the specificatio is not implied. Exposure to absolute maximum rating conditio for extended periods may affect device reliability. ELECTRICAL CHARACTERISTICS Dual Supplies ( = ±%, = ±%, = V, V A_H = V H = 2.4V, V A_L = V L =.8V, = V, = 2.4V,, unless otherwise noted.) PARAMETER SWITCH Analog Signal Range Channel On-Resistance On-Resistance Matching Between Channels (Note 4) On-Resistance Flatness (Note 5) NO-Off Leakage Current (Note 6) -Off Leakage Current (Note 6) -On Leakage Current (Note 6) SYMBOL V, V NO R ON R ON R FLAT(ON) I NO(OFF) I (OFF) I (ON) I NO = ma, V = ±3V, = 5V, = CONDITIONS I NO = ma, V = ±3.5V I NO = ma, V = ±3.5V, = 5V, = V NO = ±4.5V, V = 4.5V, = 5.5V, = -5.5V V = ±4.5V, V NO = 4.5V, = 5.5V, = -5.5V ± V = ±4.5V, V NO = 4.5V, = 5.5V, = -5.5V ± V = ±4.5V, V NO = 4.5V, ± T A = T MIN C, E to T MAX M T A = T MIN C, E to T MAX M T A = T MIN C, E to T MAX M T A = T MIN C, E to T MAX M T A = T MIN C, E to T MAX M MIN TYP MAX (Note 2) UNITS V na na na

3 ELECTRICAL CHARACTERISTICS Dual Supplies (continued) ( = ±%, = ±%, = V, V A_H = V H = 2.4V, V A_L = V L =.8V, = V, = 2.4V,, unless otherwise noted.) PARAMETER DIGITAL LOGIC INPUT Logic High Input Voltage Logic Low Input Voltage Input Current with Input Voltage High Input Current with Input Voltage Low SUPPLY Power-Supply Range Positive Supply Current SYMBOL V A_H, V H V A_L, V L I A_H, I H I A_L, I L, I+ V A_H = 2.4V, V A_L =.8V CONDITIONS MIN TYP MAX (Note 2) ±2.4 ±8 - UNITS V A_H = 2.4V, V A_L =.8V -.. µa V = V A = V/, = 5.5V, = -5.5V -.. V V µa V µa Negative Supply Current I- V = V A = V/, = 5.5V, = -5.5V AX, Data Hold Time t H Figure 5 Reset Pulse Width t Figure 6, = 5V DYNAMIC Traition Time t TRANS Figure Break-Before-Make Interval t OP Figure 2 Enable Turn-On Time t ON() Figure 3 Enable Turn-Off Time t OFF() Figure 3 Write Turn-On Time t ON() Figure 4 Reset Turn-Off Time t OFF() Figure 6 Charge Injection V CTE C L = pf, V NO = V Off Isolation (Note 7) V ISO V = V, R L = k, f = khz Crosstalk Between Channels V CT V = 2.4V, f = khz, V G = V p-p, R L = k Logic Input Capacitance C IN f = MHz NO-Off Capacitance C NO(OFF) f = MHz, V = V = V -Off Capacitance C (OFF) f = MHz, V = V = V -On Capacitance C (ON) f = MHz, V = V = V MINIMUM INPUT TIMING REQUIREMTS Write Pulse Width t W Figure 5 AX, Data Setup Time t S Figure µa pc db db pf pf pf pf 3

4 ELECTRICAL CHARACTERISTICS Single Supply ( = ±%, = V, = V, V A_H = V H = 2.4V, V A_L = V L =.8V, = V, = 2.4V,, unless otherwise noted.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX (Note 2) UNITS AX, Data Hold Time t H Figure 5 Reset Pulse Width SWITCH t Figure 6, = 5V Analog Signal Range V, V NO V On-Resistance R ON I NO = ma, V = 3.5V, = 4.5V 28 On-Resistance Matching I NO = ma, V = 3.5V, R Between Channels (Note 4) ON = 4.5V 2 On-Resistance Flatness R FLAT I NO = ma; V = 3V, 2V, V; 6 = 5V NO-Off Leakage Current V NO = 4.5V, V = V, I C, E = 5.5V T A = T MIN -.. (Note 8) NO(OFF) to T MAX M - na V = 4.5V, V NO = V, T A = T MIN C, E = 5.5V -Off Leakage Current to T MAX M -2 2 I (Note 8) (OFF) V = 4.5V, na V NO = V, T A = T MIN C, E = 5.5V to T MAX M T A = T MIN C, E -5 5 V -On Leakage Current = 4.5V, to T MAX M -4 4 I (Note 8) (ON) V NO = 4.5V, = 5.5V na T A = T MIN C, E to T MAX M -2 2 DIGITAL LOGIC INPUT Logic High Input Voltage V H, V H 2.4 V Logic Low Input Voltage V L, V L.8 V Input Current with Input Voltage High I H, I H V H = 2.4V, V L =.8V -.. µa Input Current with Input Voltage Low I L, I L V H = 2.4V, V L =.8V -.. µa SUPPLY Power-Supply Range V Positive Supply Current I+ V = V A = V, ; = 5.5V; = V -.. µa Negative Supply Current I- V = V A = V, ; = 5.5V; = V -.. µa I Supply Current I V =, V; V A = V; -.. = 5.5V; = V -.. µa 4

5 ELECTRICAL CHARACTERISTICS Single Supply (continued) ( = ±%, = V, = V, V A_H = V H = 2.4V, V A_L = V L =.8V, = V, = 2.4V,, unless otherwise noted.) PARAMETER DYNAMIC Traition Time Break-Before-Make Interval Enable Turn-On Time Enable Turn-Off Time Write Turn-On Time Reset Turn-Off Time Charge Injection SYMBOL t TRANS t OP t ON() t OFF() t ON() t OFF() V CTE Figure, V NO = 3V Figure 2 Figure 3 Figure 3 Figure 4 Figure 4 Figure 7, C L = pf, V NO = V CONDITIONS MIN TYP MAX (Note 2) UNITS pc pc ELECTRICAL CHARACTERISTICS Single +3V Supply ( = +3V ±%, = V, = V, V A_H = V H = 2.4V, V A_L = V L =.8V, = V, = 2.4V,, unless otherwise noted.) PARAMETER SWITCH Analog Signal Range On-Resistance DYNAMIC Traition Time Enable Turn-On Time Enable Turn-Off Time Charge Injection SYMBOL V ANALOG R ON t TRANS t ON() t OFF() Write Turn-On Time t ON() Figure 4 Reset Turn-Off Time t OFF() Figure 4 V CTE Figure 3, V INH = 2.4V, V INL = V, V N =.5V Figure 7, C L = pf, V NO = V CONDITIONS I NO = ma, V =.5V, = 3V Figure, V IN = 2.4V, V N =.5V, V N8 = V Figure 3, V INH = 2.4V, V INL = V, V N =.5V MIN TYP MAX (Note 2) Note 2: The algebraic convention, where the most negative value is a minimum and the most positive value a maximum, is used in this data sheet. Note 3: Guaranteed by design. Note 4: R ON = R ON(max) - R ON(min). Note 5: Flatness is defined as the difference between the maximum and minimum value of on-resistance as measured over the specified analog signal ranges, i.e., V NO = 3V to V and V to -3V. Note 6: Leakage parameters are % tested at maximum rated hot operating temperature, and guaranteed by correlation at +25 C. Note 7: Worst-case isolation is on channel 4 because of its proximity to the pin. Off isolation = 2log V /V NO, V = output, V NO = input to off switch. Note 8: Leakage testing at single supply is guaranteed by correlation testing with dual supplies. UNITS 5 V pc

6 Typical Operating Characteristics (, unless otherwise noted.) RON () ON-RESISTANCE vs. V (DUAL SUPPLIES) V± = ±3V V± = ±5V MAX398/9 TOC RON () = 5V = ON-RESISTANCE vs. V AND TEMPERATURE (DUAL SUPPLIES) T A = +85 C T A = -55 C MAX398/9 TOC2 RON () = V ON-RESISTANCE vs. V (SINGLE SUPPLY) = 3V = 5V MAX398/9 TOC V (V) V (V) V (V) RON () = 5V = V ON-RESISTANCE vs. V AND TEMPERATURE (SINGLE SUPPLY) T A = +85 C T A = -55 C MAX398/9 TOC4 OFF-LEAKAGE (pa) = 5.5V = -5.5V OFF-LEAKAGE vs. TEMPERATURE MAX398/9 TOC5, ON-LEAKAGE (pa) = 5.5V = -5.5V ON-LEAKAGE vs. TEMPERATURE MAX398/9 TOC V (V) TEMPERATURE ( C) TEMPERATURE ( C) CHARGE INJECTION vs. V SUPPLY CURRT vs. TEMPERATURE 5 MAX398/9 TOC7 = 5V = V = V A = V, 5V MAX398/9 TOC8 I+ Qj (pc) = 5V = = 5V = V I+, I- (na) I V (V) TEMPERATURE ( C) 6

7 Pin Description PIN 2, 7 NAME* ITE Logic Input FUNCTION 2, 6, 7 A, A2, A Address Logic Inputs (see Truth Tables at end of data sheet) A, A Address Logic Inputs (see Truth Tables at end of data sheet) 3 3 Enable Logic Input (see Truth Tables at end of data sheet) 4 4 Negative Supply Voltage Input. Connect to for single-supply operation. 5 8 NO NO4 Analog Signal Inputs bidirectional 5 8 NOA NO4A Analog Signal Inputs bidirectional 9 Analog Signal Output bidirectional 9, A, B Analog Signal Outputs bidirectional 3 NO8 NO5 Analog Signal Inputs bidirectional 4 NO4B NOB Analog Signal Inputs bidirectional 4 5 Positive Supply Voltage Input 5 6 Ground 8 8 RESET Logic Input *Analog inputs and outputs are names of convenience only. Inputs and outputs are identical and interchangeable. Applicatio Information The internal structures of the include tralators for the A2/A/// digital inputs, latches, and a decode section for channel selection (see Truth Tables). The analog-signal switches coist of parallel combinatio of N and P MOSFETs. ITE () and RESET () strobes are provided for interfacing with µp-bus lines, alleviating the need for the µp to provide cotant address inputs to the mux to hold a particular channel (Figures 2 7). When the strobe is in the low state (less than.8v) and the strobe is in the high state (greater than 2.4V), the muxes are in the traparent mode they act similar to nonlatching devices, such as the MAX398/MAX399. When the goes high, the previous BCD address input is latched and held in that state indefinitely. tur off all channels when it is low. All switches stay off until and are high and is low. The work with both single and dual supplies and function over the to +6V singlesupply range. For example, with a single power supply, analog signals in the V to range can be switched normally. If negative signals around V are expected, a negative supply is needed. The latch allows all switches to be turned off under program control. This is useful when two or more are cascaded to build 6-line and larger analog-signal multiplexers. 7

8 Test Circuits/Timing Diagrams 5 5 A A A2 A A NO NO2 NO7 NO8 NOB NOA NO4A A, N2B N3B NO4B B 3 3 ± ± ±3V 3V ±3V 3V 35pF 35pF LOGIC INPUT +3V V V NO_ SWITCH OUTPUT V V NO_ t TRANS 5% 9% t R < 2 t F < 2 9% t TRANS Figure. Traition Time V AH = +3V A2 N V A V 5% 5% V A 5 A A * N2 N8 k 35pF t OP *SIMILAR CONNECTION FOR Figure 2. Break-Before-Make Interval (t OP) 8

9 V AH = +3V 5% 5% V.9 V O V t OFF() t ON() Figure 3. Enable Delay (t ON(), t OFF()) V V 5 A2 A A * N N2 N3, B k *SIMILAR CONNECTION FOR +V 35pF V +3V +.5V V V 5% t ON ().2V O LOGIC INPUT A, A, (A2) * N or NB ALL N_, B k 35pF DEVICE MUST BE RESET PRIOR TO APPLYING PULSE Figure 4. Write Turn-On Time (t ON()) *SIMILAR CONNECTION FOR 3V V 5% t W 3V V 5% t toff () A, A, (A2) 3V V t t H S SWITCH V O 2% OUTPUT 8% 8% Figure 5. Write, Setup, and Hold Timing (t W, t S, t H) 9

10 +3V 5% +.5V V t OFF () V O Figure 6. Reset Turn-Off Time (t OFF()).8V O LOGIC INPUT A, A, (A2) N N N8, B k 35pF OFF ON OFF A, A, (A2) R G N_ IN V G 3V V OUT C L pf IS THE MEASURED VOLTAGE ERROR DUE TO CHARGE INJECTION. THE CHARGE IN COULOMBS IS Q = C L x V O Figure 7. Charge Injection (V CTE) Operation with Supply Voltages Other than ±5V Using supply voltages less than ±5V reduces the analog signal range. The muxes operate with ±3V to ±8V bipolar supplies or with a +2.7V to +6.5V single supply. Connect to when operating with a single supply. Both devices can also operate with unbalanced supplies, such as +V and. The Typical Operating Characteristics graphs show typical on-resistance with ±3V, ±5V, +3V and supplies. (Switching times increase by a factor of two or more for operation at or below.) Overvoltage Protection Proper power-supply sequencing is recommended for all CMOS devices. Do not exceed the absolute maximum ratings, because stresses beyond the listed ratings can cause permanent damage to the devices. Always sequence on first, then, followed by the logic inputs, NO, or. If power-supply sequencing is not possible, add two small signal diodes (D, D2) in series with supply pi for overvoltage protection (Figure 8). Adding diodes reduces the analog signal range to one diode drop below and one diode drop above, but does not affect the devices low switch resistance and low leakage characteristics. Device operation is unchanged, and the difference between and should not exceed 7V. These protection diodes are not recommended when using a single supply.

11 * * * INTERNAL PROTECTION DIODES Figure 8. Overvoltage Protection Using External Blocking Diodes D D2 * * NO Functional Diagrams/Truth Tables 8-CHANNEL SINGLE-DED MULTIPLEXER DIFFERTIAL 4-CHANNEL MULTIPLEXER NO NOA NO2 NO3 NO2A NO3A A NO4 NO5 NO4A NOB NO6 NO7 NO8 NO2B NO3B NO4B B DECODE / DRIVE DECODE / DRIVE LATCHES LATCHES A2 A A A A A2 Latching A A ON SWITCH X X X X Maintai previous switch condition Reset X X X X X Traparent Operation X X X NONE (latches cleared) NONE A A ON SWITCH Latching X X X Reset X X X X Traparent Operation X X Maintai previous switch condition NONE (latches cleared) NONE LOGIC "" = V AL.8V, LOGIC "" V AH 2.4V

12 _Ordering Information (continued) PART CPN CWN C/D EPN EWN EJN MJN TEMP. RANGE C to +7 C C to +7 C C to +7 C -4 C to +85 C -4 C to +85 C -4 C to +85 C -55 C to +25 C * Contact factory for dice specificatio. ** Contact factory for package availability. PIN-PACKAGE 8 Plastic DIP 8 Wide SO Dice* 8 Plastic DIP 8 Wide SO 8 CERDIP** 8 CERDIP** Chip Topographies AO A A2 AO A N.C. NO N.C..6" (2.95mm) NOA NOB.6" (2.95mm) NO5 NO2B NO2 NO2A NO3 NO6 NO3A NO3B NO4 NO8 NO7 NO4A NO8 NO4B NO8 A B.82" (2.8mm).82" (2.8mm) TRANSISTOR COUNT: 65 SUBSTRATE CONNECTED TO Maxim cannot assume respoibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licees are implied. Maxim reserves the right to change the circuitry and specificatio without notice at any time. 2 Maxim Integrated Products, 2 San Gabriel Drive, Sunnyvale, CA 9486 (48) Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.