LOW POWER SCHOTTKY. GUARANTEED OPERATING RANGES ORDERING INFORMATION

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1 The SN74S240 and SN74S244 are Octal Buffers and ine Drivers designed to be employed as memory address drivers, clock drivers and bus-oriented transmitters/receivers which provide improved PC board density. ysteresis at Inputs to Improve Noise Margins 3-State Outputs Drive Bus ines or Buffer Memory Address Registers Input Clamp Diodes imit igh-speed Termination Effects OW POWER SCOTTKY GUARANTEED OPERATING RANGES Symbol Parameter Min Typ Max Unit V CC Supply Voltage V T A Operating Ambient Temperature Range C I O Output Current igh 3.0 ma 15 ma I O Output Current ow 24 ma 20 1 PASTIC N SUFFIX CASE SOIC DW SUFFIX CASE 751D ORDERING INFORMATION Device Package Shipping SN74S240N 16 Pin DIP 1440 Units/Box SN74S240DW 16 Pin 2500/Tape & Reel SN74S244N 16 Pin DIP 1440 Units/Box SN74S244DW 16 Pin 2500/Tape & Reel Semiconductor Components Industries, C, 1999 December, 1999 Rev. 6 1 Publication Order Number: SN74S240/D

2 SN74S240 SN74S244 OGIC AND CONNECTION DIAGRAMS DIP (TOP VIEW) V CC SN74S240 2G 1Y1 2A4 1Y2 2A3 1Y3 2A Y4 2A G 1A1 2Y4 1A2 2Y3 1A3 2Y2 1A Y1 GND SN74S244 V CC 2G 1Y1 2A4 1Y2 2A3 1Y3 2A Y4 2A G 1A1 2Y4 1A2 2Y3 1A3 2Y2 1A Y1 GND SN74S240 INPUTS OUTPUT 1G, 2G D X (Z) TRUT TABES = IG Voltage evel = OW Voltage evel X = Immaterial Z = IG Impedance SN74S244 INPUTS OUTPUT 1G, 2G D X (Z) 2

3 SN74S240 SN74S244 DC CARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified) imits Symbol Parameter Min Typ Max Unit Test Conditions V I Input IG Voltage 2.0 V Guaranteed Input IG Voltage for All Inputs V I Input OW Voltage 0.8 V Guaranteed Input OW Voltage for All Inputs V T+ V T ysteresis V V CC = MIN V IK Input Clamp Diode Voltage V V CC = MIN, I IN = 18 ma V O V O Output IG Voltage Output OW Voltage V V CC = MIN, I O = 3.0 ma 2.0 V V CC = MIN, I O = MAX V I O = 12 ma V CC = V CC MIN, V IN =V I or V I V I O = 24 ma per Truth Table I OZ Output Off Current IG 20 µa V CC = MAX, V OUT = 2.7 V I OZ Output Off Current OW 20 µa V CC = MAX, V OUT = 0.4 V I I Input IG Current 20 µa V CC = MAX, V IN = 2.7 V 0.1 ma V CC = MAX, V IN = 7.0 V I I Input OW Current 0.2 ma V CC = MAX, V IN = 0.4 V I OS Output Short Circuit Current (Note 1) ma V CC = MAX Power Supply Current Total, Output IG 27 Total, Output OW S I CC S ma V CC = MAX Total at IG Z S S Note 1: Not more than one output should be shorted at a time, nor for more than 1 second. AC CARACTERISTICS (T A = 25 C, V CC = 5.0 V) imits Symbol Parameter Min Typ Max Unit Test Conditions t P t P Propagation Delay, Data to Output S ns t P t P Propagation Delay, Data to Output S244 t PZ Output Enable Time to IG evel ns t PZ Output Enable Time to OW evel ns ns C = 45 pf, R = 667 Ω t PZ Output Disable Time from OW evel ns C = 5.0 pf, t PZ Output Disable Time from IG evel ns R = 667 Ω 3

4 SN74S240 SN74S244 AC WAVEFORMS V IN t P t P V CC V OUT R Figure 1. SW1 TO OUTPUT UNDER TEST V IN t P t P 5 kω V OUT C * SW2 Figure 2. V E V E V OUT t PZ t PZ V O 0.5 V Figure 3. SWITC POSITIONS SYMBO SW1 t PZ Open t PZ t PZ t PZ SW2 Open Figure 5. V E V E t PZ t PZ V OUT V O 0.5 V Figure 4. 4

5 SN74S240 SN74S244 PACKAGE DIMENSIONS N SUFFIX PASTIC PACKAGE CASE ISSUE E T SEATING PANE 20 1 G E A F N B K C D 20 P 0.25 (0.010) M T A M M J 20 P 0.25 (0.010) M T B M NOTES: 1. DIMENSIONING AND TOERANCING PER ANSI Y14.5M, CONTROING DIMENSION: INC. 3. DIMENSION TO CENTER OF EAD WEN FORMED PARAE. 4. DIMENSION B DOES NOT INCUDE MOD FAS. INCES MIIMETERS DIM MIN MAX MIN MAX A B C D E BSC 1.27 BSC F G BSC 2.54 BSC J K BSC 7.62 BSC M N

6 SN74S240 SN74S244 D SUFFIX PASTIC SOIC PACKAGE CASE 751D 05 ISSUE F D A 10X 0.25 M B M E h X 45 NOTES: 1. DIMENSIONS ARE IN MIIMETERS. 2. INTERPRET DIMENSIONS AND TOERANCES PER ASME Y14.5M, DIMENSIONS D AND E DO NOT INCUDE MOD PROTRUSION. 4. MAXIMUM MOD PROTRUSION 0.15 PER SIDE. 5. DIMENSION B DOES NOT INCUDE DAMBAR PROTRUSION. AOWABE PROTRUSION SA BE 0.13 TOTA IN EXCESS OF B DIMENSION AT MAXIMUM MATERIA CONDITION. 20X B 0.25 M T A S 18X e B B S A A1 T SEATING PANE C MIIMETERS DIM MIN MAX A A B C D E e 1.27 BSC h

7 SN74S240 SN74S244 Notes 7

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9 This datasheet has been downloaded from: Datasheets for electronic components.