LH5P832. CMOS 256K (32K 8) Pseudo-Static RAM
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1 LH5P832 CMOS 256K (32K 8) Pseudo-Static RAM FEATURES 32,768 8 bit organization Access time: 100/120 ns (MAX.) Cycle time: 160/190 ns (MIN.) Power consumption: Operating: 357.5/303 mw Standby: 16.5 mw TTL compatible I/O 256 refresh cycle/4 ms Auto refresh is executed by internal counter (controlled by pin) Self refresh is executed by internal timer Single +5 V power supply Packages: 28-pin, 600-mil DIP 28-pin, 300-mil SK-DIP 28-pin, 450-mil SOP DESCRIPTION The LH5P832 is a 256K bit Pseudo-Static RAM organized as 32,768 8 bits. It is fabricated using silicon-gate CMOS process technology. The LH5P832 uses convenient on-chip refresh circuitry with a DRAM memory cell for pseudo static operation. This simplifies external clock inputs, while providing the same simple, non-multiplexed pinout as industry standard SRAMs. Moreover, due to the functional similarities between PSRAMs and SRAMs, many 32K 8 SRAM sockets can be filled with the LH5P832 with little or no changes. The advantage is the cost savings realized with the lower cost PSRAM. The LH5P832 PSRAM has the ability to fill the gap between DRAM and SRAM by offering low cost, low standby power, and a simple interface. Three methods of refresh control are provided for maximum versatility. A -Only refresh cycle refreshes the addressed row of memory cells transparently. All 256 rows must be refreshed or accessed every four milliseconds. Auto Refresh automatically cycles through a different row on every clock pulse, accomplishing the row refreshes without the need to supply row addresses externally. Self Refresh further simplifies the refresh requirements by eliminating the need for address inputs and clock pulses entirely. An automatic timer senses time periods when memory accesses have ceased, and provides full refresh of all rows of memory without any external assistance. PIN CONNECTIONS 28-PIN DIP 28-PIN SK-DIP 28-PIN SOP A 14 1 A 12 2 A 7 3 A 6 4 A 5 5 A 4 6 A 3 7 A 2 8 A 1 A 0 I/O 1 I/O 2 I/O 3 GND V CC 27 R/W A 13 A 8 A 9 A 11 A 10 I/O 8 I/O 7 I/O 6 I/O 5 I/O 4 TOP VIEW 5P832-1 Figure 1. Pin Connections for DIP, SK-DIP, and SOP Packages 1
2 LH5P832 CMOS 256K (32K 8) Pseudo-Static RAM 14 GND 28 V CC A 14 1 A A 12 2 A A A 9 24 A 8 25 A 7 3 A 6 4 A 5 5 A 4 6 A 3 7 A 2 8 A 1 9 A 0 10 COLUMN BUFFER ROW BUFFER REFRESH COUNTER EXT/INT MUX ROW DECODER COLUMN DECODER SENSE AMPS MEMORY ARRAY 256 ROWS 128 COLUMNS V BB BIAS-GENERATOR I/O SELECTOR DATA IN BUFFER DATA OUT BUFFER 11 I/O 1 12 I/O 2 13 I/O 3 15 I/O 4 16 I/O 5 17 I/O 6 18 I/O 7 19 I/O 8 20 CLOCK GENERATOR 22 AUTO-REFRESH CONTROLLER SELF-REFRESH TIMER R/W 27 5P832-2 Figure 2. LH5P832 Block Diagram PIN DESCRIPTION SIGNAL PIN NAME SIGNAL R/W Read/Write input A 8 - A 14 Output Enable/Refresh input I/O 1 - I/O 8 Data inputs and outputs V CC A 0 - A 7 Row address inputs GND PIN NAME Column Address inputs Chip Enable input Power supply Ground TRUTH TABLE R/W MODE I/O1 - I/O8 ICC NOTE L L X Write Data in Operating (I CC1 ) 1 L H L Read Data out Operating (I CC1 ) L H H -Only Refresh High-Z Operating (I CC1 ) H X L Auto Refresh High-Z Operating (I CC1 ) 1, 2 H X L Self Refresh High-Z Self Refresh (I CC3 ) 1, 3 H X H Standby High-Z Standby (I CC2 ) 1 NOTES: 1. X = H or L 2. OE Pulsewidth < 8 µs 3. OE Pulsewidth 8 µs 2
3 CMOS 256K (32K 8) Pseudo-Static RAM LH5P832 ABSOLUTE MAXIMUM RATINGS PARAMETER SYMBOL RATING UNIT NOTE Applied voltage on any pin V T -1.0 to +7.0 V 1 Output short circuit current I O 50 ma Power dissipation P D 600 mw Operating temperature Topr 0 to +70 C Storage temperature Tstg -55 to +150 C NOTE: 1. Referenced to GND RECOMMENDED OPERATING CONDITIONS (TA = 0 to +70 C) PARAMETER SYMBOL MIN. TYP. MAX. UNIT Supply voltage V CC V Input voltage 2.4 V CC V V CAPACITAN (VCC = 5.0 V ±10%, TA = 0 to +70 C, f = 1 MHz) PARAMETER CONDITIONS SYMBOL MIN. MAX. UNIT A Input capacitance 0 - A 14, R/W C IN1 8 pf, C IN2 5 pf Input/output capacitance I/O 1 - I/O 8 C OUT1 12 pf DC CHARACTERISTICS (V CC = 5 V ±10%, T A = 0 to +70 C) PARAMETER SYMBOL CONDITIONS MIN. MAX. UNIT NOTE Operating current I CC1 trc = 160 ns 65 ma 1, 2 Operating current I CC1 trc = 190 ns 55 ma 1, 2 Standby current I CC2 =, = 3 ma 1 Self refresh average current I CC3 =, = 3 ma 1 CPU internal cycle average current I CC4 trc = 160 ns 65 ma 1, 2 CPU internal cycle average current I CC4 trc = 190 ns 55 ma 1, 2 Input leakage current I LI 0 V V IN 6.5 V µa Output leakage current I LO 0 V V OUT V CC V µa 3 Output High voltage V OH I OUT = -1 ma 2.4 V Output Low voltage V OL I OUT = 4 ma 0.4 V NOTES: 1. Specified values are with outputs open. 2. I CC1 and I CC4 depend on the cycle time. 3. The output pins are in high-impedance state. AC TEST CONDITIONS PARAMETER MODE NOTE Input voltage amplitude 0.6 to 2.4 V Input rise/fall time 5 ns Timing reference level 1.5 V Output load conditions 1TTL gate, C L = 100 pf 1 NOTE: 1. Includes scope and jig capacitance. 3
4 LH5P832 CMOS 256K (32K 8) Pseudo-Static RAM AC CHARACTERISTICS READ AND WRITE CYCLES 1,2 (V CC = 5.0 V ±10%, T A = 0 to 70 C) PARAMETER SYMBOL 160 ns 190 ns UNIT NOTE MIN. MAX. MIN. MAX. Random read, write cycle time t RC ns Read modify write cycle time t RMW ns pulse width t , ,000 ns precharge time t P ns Address setup time t AS 0 0 ns Address hold time t AH ns Read command hold time t RCH 0 0 ns Read command setup time t RCS 0 0 ns access time t A ns 3 OE access time t OEA ns 3 to output in Low-Z t CLZ ns OE to output in Low-Z t OLZ 0 0 ns Output enable from end of write t WLZ 0 0 ns Chip disable to output in High-Z t CHZ ns 2 Output disable to output in High-Z t OHZ ns 2 Write enable to output in High-Z t WHZ ns 2 OE setup time t OES ns OE hold time t OEH 0 0 ns OE lead time t OEL ns Write command pulse width t WCP ns Write command setup time t WCS ns Write command hold time t WCH ns Data setup time from write t DSW ns Data setup time from t DSC ns Data hold time from write t DHW 0 0 ns Data hold time from t DHC 0 0 ns Transition time (rise and fall) t T ns Refresh time interval t REF 4 4 ms REFRESH CYCLE Auto refresh cycle time t FC ns Refresh delay time from t RFD ns Refresh pulse width (Auto refresh) t FAP 60 8, ,000 ns Refresh precharge time (Auto refresh) t FP ns delay time from refresh active (Auto refresh) t F ns Refresh pulse width (Self refresh) t FAS 8,000 8,000 ns delay time from refresh precharge (Self refresh) t FRS ns NOTES: 1. At least 200 µs of pause time after power on should be given for proper device operation. and must be fixed at for 200 µs from the V DD reached to the specified voltage level and followed by at least 8 dummy cycles. 2. AC characteristics are measured at t T = 5 ns. 3. Measured with a load circuit equivalent to 1TTL loads and 100 pf. 4
5 CMOS 256K (32K 8) Pseudo-Static RAM LH5P832 t RC t t P t AS t AH A 0 - A 14 t OEH t OEL t OES t RCS t RCH R/W t A t CHZ t OEA t OHZ I/O 1 - I/O 8 V OH V OL t OLZ DATA OUT t CLZ 5P832-3 Figure 3. Read Cycle t RC t t P t AS t AH A 0 - A 14 t OES t OEH t WCH t WCS t WCP R/W t DSW t DSC t DHW t DHC I/O 1 - I/O 8 DATA - IN 5P832-4 Figure 4. Write Cycle 5
6 LH5P832 CMOS 256K (32K 8) Pseudo-Static RAM t RMW t t P t AS t AH A 0 - A 14 t OEH t OES t RCS t WCS t WCP R/W t DSW t DSC t DHW t DHC DATA - IN t A t OEA t WHZ I/O 1 - I/O 8 t OHZ t WLZ t CHZ V OH V OL DATA OUT t OLZ t CLZ 5P832-5 Figure 5. Read/Write Cycle t RC t t P t AS t AH A 0 - A 7 t OES t OEH t RCS t RCH R/W I/O 1 - I/O 8 V OH V OL HIGH-Z NOTE: A 8 - A 14 = Don't Care 5P832-6 Figure 6. Only Refresh Cycle 6
7 CMOS 256K (32K 8) Pseudo-Static RAM LH5P832 t RFD t FC t F t FAP t FP t FAP I/O 1 - I/O V 8 OH V OL HIGH-Z NOTE: A 0 - A 14, R/W = Don't Care 5P832-7 Figure 7. Auto Refresh Cycle t RFD t FAS t FRS I/O 1 - I/O 8 V OH V OL NOTE: A 0 - A 14, R/W = Don't Care HIGH-Z Figure 8. Self Refresh Cycle 5P
8 LH5P832 CMOS 256K (32K 8) Pseudo-Static RAM PACKAGE DIAGRAMS 28DIP (DIP028-P-0600) DETAIL [0.530] [0.510] [1.429] [1.406] 0.30 [0.012] 0.20 [0.008] 0 TO [0.177] 4.00 [0.157] [0.600] TYP [0.100] TYP [0.024] 0.40 [0.016] 0.51 [0.020] MIN [0.205] 5.00 [0.197] 3.50 [0.138] 3.00 [0.118] DIMENSIONS IN MM [INCHES] MAXIMUM LIMIT MINIMUM LIMIT 28DIP-2 28-Pin, 600-mil DIP 28SK-DIP (DIP028-P-0300) DETAIL [0.278] 6.65 [0.262] [1.378] [1.354] 0.35 [0.014] 0.15 [0.006] 0 TO [0.144] 3.25 [0.128] 7.62 [0.300] TYP [0.100] TYP [0.022] 0.36 [0.014] 4.40 [0.173] 4.00 [0.157] 3.40 [0.134] 3.00 [0.118] 0.51 [0.020] MIN. DIMENSIONS IN MM [INCHES] MAXIMUM LIMIT MINIMUM LIMIT 28DIP-1 28-Pin, 300-mil SK-DIP 8
9 CMOS 256K (32K 8) Pseudo-Static RAM LH5P832 28SOP (SOP028-P-0450) 0.50 [0.020] 0.30 [0.012] 1.27 [0.050] TYP [0.067] [0.346] 8.40 [0.331] [0.488] [0.457] [0.417] [0.717] [0.701] [0.067] 0.20 [0.008] 0.10 [0.004] 0.15 [0.006] [0.040] 2.40 [0.094] 2.00 [0.079] 0.20 [0.008] 0.00 [0.000] [0.040] DIMENSIONS IN MM [INCHES] MAXIMUM LIMIT MINIMUM LIMIT 28SOP 28-Pin, 450-mil SOP ORDERING INFORMATION LH5P832 Device Type X Package - ## Speed Access Time (ns) Blank 28-pin, 600-mil DIP (DIP028-P-0600) D 28-pin, 300-mil SKDIP (SKDIP028-P-0300) N 28-pin, 450-mil SOP (SOP028-P-0450) CMOS 256K (32K x 8) Pseudo Static RAM Example: LH5P832N-12 (CMOS 256K (32K x 8) Pseudo Static RAM, 120 ns, 28-pin, 450-mil SOP) 5P
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