TMS27C256 32768 BY 8-BIT UV ERASABLE
TMS27PC256 32768 BY 8-BIT
PROGRAMMABLE READ-ONLY MEMORIES
SMLS256H– SEPTEMBER 1984 – REVISED NOVEMBER 1997
Organization . . . 32768 by 8 Bits
Single 5-V Power Supply
J PACKAGE
(TOP VIEW)
Pin Compatible With Existing 256K MOS
ROMs, PROMs, and EPROMs
V
A12
A7
A6
A5
A4
A3
A2
A1
A0
DQ0
DQ1
DQ2
GND
V
CC
1
28
27
26
25
24
23
22
21
20
19
18
17
16
15
PP
A14
A13
A8
A9
A11
G
2
All Inputs /Outputs Fully TTL Compatible
Max Access/Min Cycle Time
3
4
V
± 10%
5
CC
6
’27C/PC256-10
’27C/PC256-12
’27C/PC256-15
’27C/PC256-17
’27C/PC256-20
’27C/PC256-25
100 ns
120 ns
150 ns
170 ns
200 ns
250 ns
7
A10
E
8
9
DQ7
DQ6
DQ5
DQ4
DQ3
10
11
12
13
14
Power Saving CMOS Technology
Very High-Speed SNAP! Pulse
Programming
3-State Output Buffers
FM PACKAGE
(TOP VIEW)
400-mV Minimum DC Noise Immunity With
Standard TTL Loads
Latchup Immunity of 250 mA on All Input
and Output Lines
4
3 2 1 32 31 30
Low Power Dissipation (V
= 5.5 V)
CC
5
6
7
8
9
29
A6
A5
A4
A3
A2
A8
– Active . . . 165 mW Worst Case
– Standby . . . 1.4 mW Worst Case
(CMOS Input Levels)
28
27
A9
A11
26 NC
Temperature Range Options
G
A10
E
DQ7
DQ6
25
24
23
22
21
256K EPROM Available With MIL-STD-883C
Class B High Reliability Processing
(SMJ27C256)
A1
A0
NC
DQ0
10
11
12
13
description
14 15 16 17 18 19 20
The TMS27C256 series are 32768 by 8-bit
(262144-bit), ultraviolet (UV) light erasable,
electrically programmable read-only memories
(EPROMs).
PIN NOMENCLATURE
The TMS27PC256 series are 32768 by 8-bit
(262144-bit), one-time programmmable (OTP)
electrically programmable read-only memories
(PROMs).
A0–A14
DQ0–DQ7
E
G
GND
NC
NU
Address Inputs
Inputs (programming)/Outputs
Chip Enable/Powerdown
Output Enable
Ground
No Internal Connection
Make No External Connection
5-V Power Supply
V
CC
V
PP
†
13-V Power Supply
†
Only in program mode
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
Copyright 1997, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
1
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