AT27LV520 Datasheet, PDF (1/10 Pages) ATMEL Corporation – 512K 64K x 8 Multiplexed Addresses/ Outputs Low Voltage OTP EPROM

Features
• 8-Bit Multiplexed Addresses/Outputs
• Fast Read Access Time - 90 ns
• Dual Voltage Range Operation
– Low-Voltage Power Supply Range, 3.0V to 3.6V, or
– Standard 5V ± 10% Supply Range
• Low Power CMOS Operation
– 20 µA max. Standby for ALE = V_IH and V_CC = 3.6V
– 29 mW max. Active at 5 MHz for V_CC = 3.6V
• 20-Lead TSSOP Package
• High Reliability CMOS Technology
– 2,000V ESD Protection
– 200 mA Latchup Immunity
• Rapid^™ Programming Algorithm - 50 µs/byte (typical)
• CMOS and TTL Compatible Inputs and Outputs
– JEDEC Standard for LVTTL
• Integrated Product Identification Code
• Commercial and Industrial Temperature Range
Description
The AT27LV520 is a low-power, high-performance 524,288-bit one-time programma-
ble read only memory (OTP EPROM) organized 64K by 8 bits. It incorporates latches
for the 8 lower order address bits to multiplex with the 8 data bits. This minimizes sys-
tem chip count, reduces cost, and simplifies the design of multiplexed bus systems. It
requires only one power supply in the range of 3.0V to 3.6V for normal read mode
operation, making it ideal for fast, portable systems using battery power. Any byte can
be accessed in less than 90 ns.
The AT27LV520 is available in 173 mil, 20-pin TSSOP, 300 mil, 20-pin SOIC and 28-
pin TSOP, one-time programmable (OTP) plastic packages.
(continued)
Pin Configurations
TSSOP Top View
Pin Name Function
A8 - A15
AD0 - AD7
OE /V_PP
ALE
Addresses
Addresses/Outputs
Output Enable/V_PP
Address Latch Enable
A10 1
A12 2
A14 3
ALE 4
VCC 5
OE/VPP 6
A15 7
A13 8
A11 9
A9 10
20 A8
19 AD1
18 AD3
17 AD5
16 AD7
15 GND
14 AD6
13 AD4
12 AD2
11 AD0
TSOP Top View
A10
NC
NC
A12
A14
ALE
VCC
OE/VPP
A15
A13
A11
NC
NC
A9
22
23
24
25
26
27
28
1
2
3
4
5
6
7
21 A8
20 NC
19 NC
18 AD1
17 AD3
16 AD5
15 AD7
14 GND
13 AD6
12 AD4
11 AD2
10 NC
9 NC
8 AD0
SOIC Top View
OE/VPP 1
A15 2
A13 3
A11 4
A9 5
AD0 6
AD2 7
AD4 8
AD6 9
GND 10
20 VCC
19 ALE
18 A14
17 A12
16 A10
15 A8
14 AD1
13 AD3
12 AD5
11 AD7
512K (64K x 8)
Multiplexed
Addresses/
Outputs
Low Voltage
OTP EPROM
AT27LV520
Rev. 0911B-B–01/98
1