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PDF IDT71256L55D Data sheet ( Hoja de datos )
| Número de pieza | IDT71256L55D | |
| Descripción | CMOS STATIC RAM 256K (32K x 8-BIT) | |
| Fabricantes | Integrated Device Technology | |
| Logotipo |  |
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Integrated Device Technology, Inc.
CMOS STATIC RAM
256K (32K x 8-BIT)
IDT71256S
IDT71256L
FEATURES:
• High-speed address/chip select time
— Military: 25/30/35/45/55/70/85/100/120/150ns (max.)
— Commercial: 20/25/35/45ns (max.) Low Power only.
• Low-power operation
• Battery Backup operation — 2V data retention
• Produced with advanced high-performance CMOS
technology
• Input and output directly TTL-compatible
• Available in standard 28-pin (300 or 600 mil) ceramic
DIP, 28-pin (600 mil) plastic DIP, 28-pin (300 mil) SOJ
and 32-pin LCC
• Military product compliant to MIL-STD-883, Class B
DESCRIPTION:
The IDT71256 is a 262,144-bit high-speed static RAM
organized as 32K x 8. It is fabricated using IDT’s high-
performance, high-reliability CMOS technology.
Address access times as fast as 20ns are available with
power consumption of only 350mW (typ.). The circuit also
offers a reduced power standby mode. When CS goes HIGH,
the circuit will automatically go to, and remain in, a low-power
standby mode as long as CS remains HIGH. In the full standby
mode, the low-power device consumes less than 15µW,
typically. This capability provides significant system level
power and cooling savings. The low-power (L) version also
offers a battery backup data retention capability where the
circuit typically consumes only 5µW when operating off a 2V
battery.
The lDT71256 is packaged in a 28-pin (300 or 600 mil)
ceramic DIP, a 28-pin 300 mil J-bend SOlC, and a 28-pin (600
mil) plastic DIP, and 32-pin LCC providing high board-level
packing densities.
The IDT71256 military RAM is manufactured in compliance
with the latest revision of MIL-STD-883, Class B, making it
ideally suited to military temperature applications demanding
the highest level of performance and reliability.
FUNCTIONAL BLOCK DIAGRAM
A0 V CC
ADDRESS
DECODER
262,144 BIT
MEMORY ARRAY
GND
A14
I/O 0
I/O 7
INPUT
DATA
CIRCUIT
I/O CONTROL
CS
OE
WE
CONTROL
CIRCUIT
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
MILITARY AND COMMERCIAL TEMPERATURE RANGES
©1996 Integrated Device Technology, Inc.
7.2
2946 drw 01
AUGUST 1996
DSC-2946/7
1
1 page  
IDT71256S/L
CMOS STATIC RAM 256K (32K x 8-BIT)
LOW VCC DATA RETENTION WAVEFORM
MILITARY AND COMMERCIAL TEMPERATURE RANGES
DATA
RETENTION
VCC
4.5V
MODE
4.5V
tCDR
VDR ≥2V
tR
CS
VIH
VDR
VIH
2946 drw 06
AC ELECTRICAL CHARACTERISTICS (VCC = 5.0V ± 10%, All Temperature Ranges)
71256L20(1)
71256S25 71256S30(3)
71256L25 71256L30(3)
71256S35
71256L35
Symbol
Parameter
Min. Max. Min. Max. Min. Max. Min. Max.
Read Cycle
tRC Read Cycle Time
20 —
25 — 30 — 35 —
tAA Address Access Time
— 20
— 25 — 30 — 35
tACS
tCLZ(2)
tCHZ(2)
Chip Select Access Time
Chip Select to Output in Low-Z
Chip Deselect to Output in High-Z
— 20
5—
— 10
— 25 — 30 — 35
5— 5 — 5 —
— 11 — 15 — 15
tOE
tOLZ(2)
tOHZ(2)
Output Enable to Output Valid
Output Enable to Output in Low-Z
Output Disable to Output in High-Z
— 10
2—
28
— 11 — 13 — 15
2— 2 — 2 —
2 10 2 12 2 15
tOH Output Hold from Address Change
5—
5— 5 — 5 —
Write Cycle
tWC Write Cycle Time
20 —
25 — 30 — 35 —
tCW Chip Select to End-of-Write
15 —
20 — 25 — 30 —
tAW Address Valid to End-of-Write
15 —
20 — 25 — 30 —
tAS Address Set-up Time
0—
0— 0 — 0 —
tWP Write Pulse Width
15 —
20 — 25 — 30 —
tWR Write Recovery Time
0—
0— 0 — 0 —
tDW
tWHZ(2)
Data to Write Time Overlap
Write Enable to Output in High-Z
11 —
— 10
13 — 14 — 15 —
— 11 — 15 — 15
tDH Data Hold from Write Time
0—
0— 0 — 0 —
tOW(2) Output Active from End-of-Write
5—
5— 5 — 5 —
NOTES:
1. 0° to +70°C temperature range only.
2. This parameter guaranteed by device characterization, but is not production tested.
3. –55° to +125°C temperature range only.
71256S45
71256L45
Min. Max. Unit
45 — ns
— 45 ns
— 45 ns
5 — ns
— 20 ns
— 20 ns
0 — ns
— 20 ns
5 — ns
45 — ns
40 — ns
40 — ns
0 — ns
35 — ns
0 — ns
20 — ns
— 20 ns
0 — ns
5 — ns
2946 tbl 11
7.2 5
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| PDF Descargar | [ Datasheet IDT71256L55D.PDF ] | |
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