AT27C400
1
1
2
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4
5
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7
8
9
10
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12
13
14
15
16
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19
20
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24
48
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46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
A15
A14
A13
A12
A11
A10
A9
A8
NC
NC
NC
NC
NC
NC
NC
NC
A17
A7
A6
A5
A4
A3
A2
A1
A16
BYTE/VPP
GND
015/A-1
I/O7
O14
O6
O13
O5
O12
O4
VCC
O11
O3
O10
O2
O9
O1
O8
O0
OE
GND
CE
A0
PDIP Top View
1
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3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
A17
A7
A6
A5
A4
A3
A2
A1
A0
CE
GND
OE
O0
O8
O1
O9
O2
O10
O3
O11
A8
A9
A10
A11
A12
A13
A14
A15
A16
BYTE/VPP
GND
015/A-1
O7
O14
O6
O13
O5
O12
O4
VCC
SOIC (SOP)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
A17
A7
A6
A5
A4
A3
A2
A1
A0
CE
GND
OE
O0
O8
O1
O9
O2
O10
O3
O11
A8
A9
A10
A11
A12
A13
A14
A15
A16
BYTE/VPP
GND
015/A-1
O7
O14
O6
O13
O5
O12
O4
VCC
0844A-A–7/97
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.
4-Megabit
(256K x 16 or
512K x 8) OTP
EPROM
AT27C400
Preliminary
Pin Configurations
Note: Both GND pins must be
connected.
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
TSOP
Type 1