AT27C020
Features
• Fast Read Access Time - 55 ns
• Low Power CMOS Operation
– 100 µA max. Standby
– 25 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
– 2,000V ESD Protection
2-Megabit
(256K x 8)
OTP EPROM
– 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
Description
AT27C020
The AT27C020 is a low-power, high performance 2,097,152-bit one-time programma-
ble read only memory (OTP EPROM) organized as 256K by 8 bits. It requires only
one 5V power supply in normal read mode operation. Any byte can be accessed in
less than 55 ns, eliminating the need for speed reducing WAIT states on high perfor-
mance microprocessor systems.
In read mode, the AT27C020 typically consumes 8 mA. Standby mode supply current
is typically less than 10 µA.
PLCC Top View
Pin Configurations
Pin Name Function
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
A0 - A17
O0 - O7
CE
Addresses
Outputs
A2 10
A1 11
A0 12
O0 13
Chip Enable
Output Enable
Program Strobe
OE
PGM
TSOP Top View
Type 1
PDIP Top View
VPP
A16
A15
A12
A7
1
2
3
4
5
6
7
8
9
32 VCC
31 PGM
30 A17
29 A14
28 A13
27 A8
26 A9
25 A11
24 OE
23 A10
22 CE
21 07
A11
A9
1
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
OE
A10
CE
07
2
A8
3
A13
A14
A17
PGM
VCC
VPP
A16
A15
A12
A7
4
5
06
A6
6
05
A5
7
04
A4
8
03
A3
9
GND
02
A2 10
A1 11
A0 12
O0 13
O1 14
O2 15
GND 16
10
11
12
13
14
15
16
01
O0
A0
A1
A2
A3
20 06
A6
19 05
Rev. 0570C-B–12/97
A5
18 04
A4
17 03
1