Rainbow Electronics AT27C256R - Manual

1
Features
• Fast Read Access Time - 45 ns
• Low-Power CMOS Operation
– 100
µµµµ
A max. Standby
– 20 mA max. Active at 5 MHz
• JEDEC Standard Packages
– 28-Lead 600-mil PDIP
– 32-Lead PLCC
– 28-Lead TSOP and SOIC
• 5V
±
10% Supply
• High Reliability CMOS Technology
– 2,000V ESD Protection
– 200 mA Latchup Immunity
• Rapid ™ Programming Algorithm - 100
µµµµ
s/byte (typical)
• CMOS and TTL Compatible Inputs and Outputs
• Integrated Product Identification Code
• Commercial, Industrial and Automotive Temperature Ranges
Description
The AT27C256R is a low-power, high-performance 262,144-bit one-time programma-
ble read only memory (OTP EPROM) organized 32K by 8 bits. It requires only one 5V
power supply in normal read mode operation. Any byte can be accessed in less than
45 ns, eliminating the need for speed reducing WAIT states on high-performance
microprocessor systems.
Atmel’s scaled CMOS technology provides low-active power consumption, and fast
programming. Power consumption is typically only 8 mA in Active Mode and less than
10
µ
A in Standby.
256K (32K x 8)
OTP EPROM
AT27C256R
Rev. 0014H–07/98
256K EPROM
Pin Configurations
Pin Name Function
A0 to A14 Addresses
O0 - O7 Outputs
CE Chip Enable
OE Output Enable
NC No Connect
TSOP Top View
Type 1
1
2
3
4
5
6
7
21
20
19
18
17
16
15
14
13
12
11
10
9
8
VPP
A12
A7
A6
A5
A4
A3
A10
CE
O7
O6
O5
O4
O3
GND
O2
O1
O0
A0
A1
A2
OE
A11
A9
A8
A13
A14
VCC
22
23
24
25
26
27
28
PLCC Top View
Note: PLCC Package Pins 1 and
17 are DON’T CONNECT.
5
6
7
8
9
10
11
12
13
29
28
27
26
25
24
23
22
21
A6
A5
A4
A3
A2
A1
A0
NC
O0
A8
A9
A11
NC
OE
A10
CE
O7
O6
4 3 2 1
32 31 30
14 15 16 17 18 19 20
O1 O2
GND
NC O3 O4 O5
A7 A12 VPP NC VCC A14 A13
(continued)
PDIP, SOIC Top View
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
VPP
A12
A7
A6
A5
A4
A3
A2
A1
A0
O0
O1
O2
GND
VCC
A14
A13
A8
A9
A11
OE
A10
CE
O7
O6
O5
O4
O3