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What is WS27C256L-15?

This electronic component, produced by the manufacturer "STMicroelectronics", performs the same function as "Military 32K x 8 CMOS EPROM".


WS27C256L-15 Datasheet PDF - STMicroelectronics

Part Number WS27C256L-15
Description Military 32K x 8 CMOS EPROM
Manufacturers STMicroelectronics　
Logo STMicroelectronics Logo　


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WS27C256L
Military 32K x 8 CMOS EPROM
KEY FEATURES
• High Performance CMOS
— 120 ns Access Time
• Fast Programming
• DESC SMD No. 5962-86063
• Ceramic Leadless Chip Carrier (CLLCC)
• EPI Processing
— Latch-Up Immunity to 200 mA
— ESD Protection Exceeds 2000 Volts
• 300 Mil DIP or Standard 600 Mil DIP
• JEDEC Standard Pin Configuration
GENERAL DESCRIPTION
The WS27C256L is a performance oriented 256K UV Erasable Electrically Programmable Read Only Memory
organized as 32K words x 8 bits/word. It is manufactured using an advanced CMOS technology which enables it to
operate at speeds up to 120 nsecs. The memory was designed utilizing WSI's patented self-aligned split gate
EPROM cell, resulting in a low power device with a very cost effective die size.
The WS27C256L 256K EPROM provides 32K of 8 bit wide code store capacity for DSP, microprocessor, and
microcontroller-based systems. Its 120 nsec access time over the full Military temperature range provides the
potential of no-wait state operation. And where this parameter is important, the WS27C256L provides the user with
a very fast 35 nsec TOE output enable time.
The WS27C256L is offered in a 28 pin 300 mil skinny CERDIP or the standard 600 mil CERDIP, and also in a
32 pad Ceramic Leadless Chip Carrier (CLLCC) for surface mount applications. All packages incorporate the
standard JEDEC EPROM pinout.
PIN CONFIGURATION
Chip Carrier
TOP VIEW
CERDIP
A6
4
5
3
2
1
32 31 30
29
A8
A5 6
28 A9
A4 7
27 A11
A3 8
26 NC
A2 9
25 OE
A1 10
24 A10
A0 11
23 CE/PGM
NC 12
22 O7
O0 13
21 O6
14 15 16 17 18 19 20
O1 O2 NC O3 O4 O5
PRODUCT SELECTION GUIDE
PARAMETER
Address Access Time (Max)
Chip Select Time (Max)
Output Enable Time (Max)
Return to Main Menu
WS27C256L-12
120 ns
120 ns
35 ns
VPP
A12
A7
A6
A5
A4
A3
A2
A1
A0
O0
O1
O2
GND
1
2
3
4
5
6
7
8
9
10
11
12
13
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
WS27C256L-15
150 ns
150 ns
40 ns
WS27C256L-20
200 ns
200 ns
40 ns
4-19

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WS27C256L-15 equivalent
WS27C256L
MODE SELECTION
The modes of operation of the WS27C256L are listed below. A single 5 V power supply is required in the read
mode. All inputs are TTL levels except for VPP and A9 for device signature.
MODE
PINS CE/PGM OE A9 A0 VPP VCC OUTPUTS
Read
Output Disable
Standby
Programming
Program Verify
Program Inhibit
Signature
Manufacturer(13)
Device(13)
VIL
X
VIH
VIL
X
VIH
VIL
VIL
VIL X
X
VCC 5.0 V
DOUT
VIH X
X VCC 5.0 V High Z
X X X VCC 5.0 V High Z
VIH X
X
VPP(12)
5.8 V
DIN
VIL X
X
VPP(12)
5.8 V
DOUT
VIH X
X
VPP(12)
5.0 V
High Z
VIL VH(12) VIL
VCC 5.0 V
23 H
VIL VH(12) VIH
VCC 5.0 V
C0 H
NOTES: 11. X can be VIL or VIH.
12. VH = VPP = 12.5 ± 0.5 V.
13. A1 – A8, A10 – A14 = VIL.
ORDERING INFORMATION
PART NUMBER
SPEED
(ns)
PACKAGE
TYPE
PACKAGE
DRAWING
OPERATING
TEMPERATURE
RANGE
WSI
MANUFACTURING
PROCEDURE
WS27C256L-12CMB*
WS27C256L-12DMB*
WS27C256L-12TMB*
WS27C256L-15DMB*
WS27C256L-15TMB*
WS27C256L-20DMB*
120
120
120
150
150
200
32 Pad CLLCC
28 Pin CERDIP, 0.6"
28 Pin CERDIP, 0.3"
28 Pin CERDIP, 0.6"
28 Pin CERDIP, 0.3"
28 Pin CERDIP, 0.6"
C2
D2
T2
D2
T2
D2
Military
Military
Military
Military
Military
Military
MIL-STD-883C
MIL-STD-883C
MIL-STD-883C
MIL-STD-883C
MIL-STD-883C
MIL-STD-883C
NOTE: The actual part marking will not include the initials "WS."
*SMD product. See page 4-1 for SMD number.
PROGRAMMING/ALGORITHMS/ERASURE/PROGRAMMERS
The WS27C256L is programmed using Algorithm C shown on page 5-7.
REFER TO
PAGE 5-1
Return to Main Menu
4-23


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