AT27C400 Datasheet, PDF (1/10 Pages) ATMEL Corporation – 4-Megabit 256K x 16 or 512K x 8 OTP EPROM

AT27C400
Features
• Fast Read Access Time - 70 ns
• Word-wide or Byte-wide Configurable
• 4 Megabit Flash and Mask ROM Compatible
• Low Power CMOS Operation
– 100 µA Maximum Standby
– 50 mA Maximum Active at 5 MHz
• Wide Selection of JEDEC Standard Packages
– 40-Lead 600 mil PDIP
– 40-Lead SOIC (SOP)
– 48-Lead TSOP (12 mm x 20 mm)
• 5V ± 10% Power Supply
• High Reliability CMOS Technology
– 2,000V ESD Protection
– 200 mA Latchup Immunity
• Rapid^™Programming Algorithm - 50 µs/word (typical)
• CMOS and TTL Compatible Inputs and Outputs
• Integrated Product Identification Code
• Commercial and Industrial Temperature Ranges
Description
The AT27C400 is a low-power, high-performance 4,194,304-bit one-time programma-
ble read only memory (OTP EPROM) organized as either 256K by 16 or 512K by 8
bits. It requires a single 5V power supply in normal read mode operation. Any word
can be accessed in less than 70 ns, eliminating the need for speed-reducing WAIT
states. The by-16 organization makes this part ideal for high-performance 16- and 32-
bit microprocessor systems.
Pin Configurations
PDIP Top View
SOIC (SOP)
Pin Name Function
A0 - A17 Addresses
O0 - O15 Outputs
O15/A-1 Output/Address
BYTE/VPP
Byte Mode/
Program Supply
CE
Chip Enable
OE
Output Enable
NC
No Connect
A17 1
A7 2
A6 3
A5 4
A4 5
A3 6
A2 7
A1 8
A0 9
CE 10
GND 11
OE 12
O0 13
O8 14
O1 15
O9 16
O2 17
O10 18
O3 19
O11 20
40 A8
39 A9
38 A10
37 A11
36 A12
35 A13
34 A14
33 A15
32 A16
31 BYTE/VPP
30 GND
29 015/A-1
28 O7
27 O14
26 O6
25 O13
24 O5
23 O12
22 O4
21 VCC
TSOP
Type 1
A17 1
A7 2
A6 3
A5 4
A4 5
A3 6
A2 7
A1 8
A0 9
CE 10
GND 11
OE 12
O0 13
O8 14
O1 15
O9 16
O2 17
O10 18
O3 19
O11 20
40 A8
39 A9
38 A10
37 A11
36 A12
35 A13
34 A14
33 A15
32 A16
31 BYTE/VPP
30 GND
29 015/A-1
28 O7
27 O14
26 O6
25 O13
24 O5
23 O12
22 O4
21 VCC
Note: Both GND pins must be
connected.
A15 1
A14 2
A13 3
A12 4
A11 5
A10 6
A9 7
A8 8
NC 9
NC 10
NC 11
NC 12
NC 13
NC 14
NC 15
NC 16
A17 17
A7 18
A6 19
A5 20
A4 21
A3 22
A2 23
A1 24
48 A16
47 BYTE/VPP
46 GND
45 015/A-1
44 I/O7
43 O14
42 O6
41 O13
40 O5
39 O12
38 O4
37 VCC
36 O11
35 O3
34 O10
33 O2
32 O9
31 O1
30 O8
29 O0
28 OE
27 GND
26 CE
25 A0
4-Megabit
(256K x 16 or
512K x 8) OTP
EPROM
AT27C400
Preliminary
0844A-A–7/97
1