Features
• Fast Read Access Time – 70 ns
• Low Power CMOS Operation
– 100 µA Max Standby
– 30 mA Max Active at 5 MHz
• JEDEC Standard Packages
– 32-lead, 600-mil PDIP
– 32-lead PLCC
– 32-lead TSOP
• 5V ±10% Supply
• High Reliability CMOS Technology
4-Megabit
(512K x 8)
OTP EPROM
– 2000V ESD Protection
– 200 mA Latchup Immunity
• Rapid™ Programming Algorithm – 100 µs/Byte (Typical)
• CMOS and TTL Compatible Inputs and Outputs
• Integrated Product Identification Code
• Commercial and Industrial Temperature Ranges
AT27C040
Description
The AT27C040 chip is a low-power, high-performance, 4,194,304-bit one-time pro-
grammable read-only memory (OTP EPROM) organized as 512K by 8 bits. The
AT27C040 requires only one 5V power supply in normal read mode operation. Any
byte can be accessed in less than 70 ns, eliminating the need for speed reducing
WAIT states on high-performance microprocessor systems.
TSOP Top View
Pin Configurations
A11
A9
1
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
OE
A10
CE
07
Pin Name
A0 - A18
O0 - O7
CE
Function
2
A8
3
Addresses
Outputs
A13
A14
A17
A18
VCC
VPP
A16
A15
A12
A7
4
5
06
6
05
7
04
Chip Enable
Output Enable
8
03
9
GND
02
OE
10
11
12
13
14
15
16
01
O0
A0
A1
A2
A3
A6
PDIP Top View
A5
A4
VPP
1
2
3
4
5
6
7
8
9
32 VCC
A16
A15
A12
A7
31 A18
30 A17
29 A14
28 A13
27 A8
26 A9
25 A11
24 OE
23 A10
22 CE
21 07
20 06
19 05
18 04
17 03
PLCC Top View
A6
A5
A4
A3
A7
A6
A5
A4
A3
5
6
7
8
9
29 A14
28 A13
27 A8
26 A9
25 A11
24 OE
23 A10
22 CE
21 07
A2 10
A1 11
A0 12
O0 13
O1 14
O2 15
GND 16
A2 10
A1 11
A0 12
O0 13
0189F–EPROM–4/03
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