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PDF TC55257BPL-85LV Data sheet ( Hoja de datos )

Número de pieza TC55257BPL-85LV
Descripción SILICON GATE CMOS STATIC RAM
Fabricantes Toshiba 
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TOSHIBA
TC55257BPL/BFL/BSPL/BFIL/BTRL85L/IOL(LV)
SILICON GATE CMOS
32,768 WORD x 8 BIT STATIC RAM
Description
The TC55257BPL is a 262,144 bit CMOS static random access memory organized as 32,768 words by 8 bits and operated from a
single 5V power supply. Advanced circuit techniques provide both high speed and low power features with an operating current of
5mNMHz fup.) and a minimum cycle time of 85ns.
When CE is a logical high, the device is placed in a low power standby mode in which the standby current is 2J,lA at room tem-
perature. The TC55257BPL has two control inputs. Chip enable (CE) allows for device selection and data retention control, while an
output enable input (OE) provides fast memory access. The TC55257BPL is suitable for use in microprocessor systems where high
speed, low power, and battery backup are required.
The TC55257BPL is offered in a standard dual-in-line 28-pin plastic package (0.6/0.3 inch width), a small outline plastic pack-
age, and a thin small outline plastic package (forward type, reverse type).
Features
• Low power dissipation:
• Standby current:
• Single 5V power supply
• Access time (max.)
27.5mW/MHz (typ.)
21lA (max.) at Ta =25°C
TC55257BPL/BFl/BSPL/BFTL/BTRL
Access Time
Chip Enable Access Time
Output Enable Time
-85L(LV)
85ns
85ns
45ns
-10L(LV)
100ns
100ns
50ns
• Power down feature:
CE
• Data retention supply voltage:
2.0 - 5.5V
• Inputs and outputs TIL compatible
• Package
TC55257BPL: DIP28-P-600
TC55257BFL : SOP28-P-450
TC55257BSPL : DIP28-P-300B
TC55257BFTL : TSOP28-P
TC55257BTRL : TSOP28-P-A
Pin Names
AO - A14 Address Inputs
RIW
ReadlWrite Control Input
OE Output Enable Input
CE Chip Enable Input
1/01 - 1/08 Data Input/Output
V DD
GND
Power (+5V)
Ground
Pin Connection (Top View)
A14
A12
A7
AS
A4
A3
A2
1101
1/02
1/03
GNO
Voo
RJW
A13
A8
A9
A1l
OE
Al0
CE
1108
1107
1/06
1/05
1/04
(forward type)
14
~S 28
( reverse type)
14
28 1~
PIN NO.
1 2 3 4 5 6 7 8 9 10 11 12 13 14
PIN NAME OE All
Ag
As A13 RIW VDD A14 A12
A7
A6
As
A4
A3
PIN NO.
15 16 17 18 19 20 21 22 23 24 25 26 27 28
PIN NAME
A2
Al
Ao 1101 1/02 1/03 GND 1/04 1/05 1/06 1/07 1108 CE Al0
TOSHIBA AMERICA ELECTRONIC COMPDNENTS, INC.
A-33

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TC55257BPL-85LV pdf
Timing Waveforms
Read Cycle (1)
ADDRESSES
Static RAM TC55257BPUBFUBSPUBFTUBTRL-85U10L(LV)
DOUT
Write Cycle 1 (4) (RIW Controlled Write)
ADDRESSES
RIW
UNKNOWN
OUTPUT DATA VALID
twc
twp
DOUT
DIN
DATA STABLE
TOSHIBA AMERICA ELECTRONIC COMPONENTS, INC.
A-37

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