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PDF WS57C256F-70CMB Data sheet ( Hoja de datos )
| Número de pieza | WS57C256F-70CMB | |
| Descripción | HIGH SPEED 32K x 8 CMOS EPROM | |
| Fabricantes | STMicroelectronics | |
| Logotipo |  |
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WS57C256F
MILITARY HIGH SPEED 32K x 8 CMOS EPROM
• Fast Access Time
— 55 ns
• Low Power Consumption
• DESC SMD No. 5962-86063
KEY FEATURES
• EPI Processing
— Latch-up Immunity Up to 200 mA
• Standard EPROM Pinout
GENERAL DESCRIPTION
The WS57C256F is a High Performance 256K UV Erasable Electrically Programmable Read Only Memory. It is
manufactured using an advanced CMOS process technology enabling it to operate at speeds as fast as 55 ns
Access Time.
Two major features of the WS57C256F are its Low Power and High Speed. While operating in a TTL environment it
consumes less than 120 mA while cycling at full speed. Additionally, the WS57C256F can be placed in a standby
mode which drops operating current below 5 mA in a TTL environment and 500 µA in a CMOS environment.
The WS57C256F also has exceptional output drive capability. It can source 4 mA and sink 16 mA per output.
The WS57C256F is configured in the standard EPROM pinout which provides an easy upgrade path for systems
which are currently using standard EPROMs.
MODE SELECTION
PINS CE/
MODE
PGM
OE
A9
A0 VPP VCC OUTPUTS
Read
Output
Disable
VIL VIL X
X VIH X
X VCC VCC DOUT
X VCC VCC High Z
Standby
Program
Program
Verify
VIH X
VIL VIH
X
X
X VIL X
X VCC VCC
X VPP2 VCC
High Z
DIN
X VPP2 VCC DOUT
Program
Inhibit
Signature3
VIH VIH X X VPP2 VCC
VIL VIL VH2 VIL VCC VCC
VIL VIL VH2 VIH VCC VCC
High Z
23 H4
EO H5
NOTES:
1. X can be VIL or VIH.
2. VIH = VPP = 12.75 ± 0.25 V.
3. A1 – A8, A10 – A14 = VIL.
4. Manufacturer Signature.
5. Device Signature.
PRODUCT SELECTION GUIDE
PARAMETER
Address Access Time (Max)
Output Enable Time (Max)
PIN CONFIGURATION
TOP VIEW
Chip Carrier
CERDIP
VPP 1
A6
4
5
3
2
1
32 31 30
29
A8
A12 2
A7 3
A5 6
28 A9
A6 4
A4 7
27
A3 8
26
A2 9
25
A1 10
24
A0 11
23
NC 12
22
O0 13
21
14 15 16 17 18 19 20
A11
NC
OE
A10
CE/PGM
O7
O6
A5 5
A4 6
A3 7
A2 8
A1 9
A0 10
O0 11
O1 12
O2 13
O1 O2 NC O3 O4 O5
GND 14
28 VCC
27 A14
26 A13
25 A8
24 A9
23 A11
22 OE
21 A10
20 CE/PGM
19 O7
18 O6
17 O5
16 O4
15 O3
WS57C256F-55
55 ns
25 ns
WS57C256F-70
70 ns
30 ns
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