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AT27C256R-45TC

Description
IC EPROM 256K PARALLEL 28TSOP
Categorystorage   
File Size175KB,12 Pages
ManufacturerMicrochip
Websitehttps://www.microchip.com
Download Datasheet Parametric View All

AT27C256R-45TC Overview

IC EPROM 256K PARALLEL 28TSOP

AT27C256R-45TC Parametric

Parameter NameAttribute value
memory typenon-volatile
memory formatEPROM
technologyEPROM - OTP
storage256Kb (32K x 8)
Write cycle time - words, pages-
interview time45ns
memory interfacein parallel
Voltage - Power4.5 V ~ 5.5 V
Operating temperature0°C ~ 70°C(TC)
Installation typesurface mount
Package/casing28-TSSOP (0.465", 11.80mm wide)
Supplier device packaging28-TSOP
Features
Fast Read Access Time - 45 ns
Low-Power CMOS Operation
– 100 µA 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 µs/byte (typical)
CMOS and TTL Compatible Inputs and Outputs
Integrated Product Identification Code
Commercial, Industrial and Automotive Temperature Ranges
256K (32K x 8)
OTP EPROM
AT27C256R
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
µA
in Standby.
(continued)
Pin Configurations
Pin Name
A0 - A14
O0 - O7
CE
OE
NC
Function
Addresses
Outputs
Chip Enable
Output Enable
No Connect
PDIP SOIC Top View
,
VPP
A12
A7
A6
A5
A4
A3
A2
A1
A0
O0
O1
O2
GND
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
VCC
A14
A13
A8
A9
A11
OE
A10
CE
O7
O6
O5
O4
O3
256K EPROM
PLCC Top View
TSOP Top View
Type 1
A8
A9
A11
NC
OE
A10
CE
O7
O6
OE
A11
A9
A8
A13
A14
VCC
VPP
A12
A7
A6
A5
A4
A3
22
23
24
25
26
27
28
1
2
3
4
5
6
7
21
20
19
18
17
16
15
14
13
12
11
10
9
8
A10
CE
O7
O6
O5
O4
O3
GND
O2
O1
O0
A0
A1
A2
A7
A12
VPP
NC
VCC
A14
A13
O1
O2
GND
NC
O3
O4
O5
14
15
16
17
18
19
20
A6
A5
A4
A3
A2
A1
A0
NC
O0
5
6
7
8
9
10
11
12
13
4
3
2
1
32
31
30
29
28
27
26
25
24
23
22
21
Note:
PLCC Package Pins 1 and
17 are DON’T CONNECT.
Rev. 0014H–07/98
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