參數(shù)資料
型號(hào)： 87C257
廠商： 意法半導(dǎo)體
元件分類： EPROM
英文描述： ADDRESS LATCHED 256K 32K x 8 UV EPROM and OTP EPROM
中文描述： 地址鎖存256K 32K的× 8紫外線EPROM和檢察官辦公室存儲(chǔ)器
文件頁數(shù)： 1/13頁
文件大?。?/td> 143K
代理商： 87C257
M87C257
ADDRESS LATCHED
256K (32K x 8) UV EPROM and OTP EPROM
June 1996
1/13
AI00928B
15
A0-A14
ASVPP
Q0-Q7
VCC
M87C257
G
E
VSS
8
Figure 1. Logic Diagram
INTEGRATED ADDRESS LATCH
FAST ACCESS TIME: 45ns
LOW POWER “CMOS” CONSUMPTION:
– Active Current 30mA
– Standby Current 100
μ
A
PROGRAMMING VOLTAGE: 12.75V
ELECTRONIC SIGNATURE for AUTOMATED
PROGRAMMING
PROGRAMMING TIMES of AROUND 3sec.
(PRESTO II ALGORITHM)
DESCRIPTION
The M87C257 is a high speed 262,144 bit UV
erasable and electrically programmable EPROM.
The M87C257 incorporates latches for all address
inputs to minimize chip count, reduce cost, and
simplify the design of multiplexed bus systems.
The Window Ceramic Frit-Seal Dual-in-Line pack-
age has a transparent lid which allows the user to
expose the chip to ultraviolet light to erase the bit
pattern. A new pattern can then be written to the
device by following the programming procedure.
For applications where the content is programmed
only one time and erasure is not required, the
M87C257 is offered in Plastic Leaded Chip Carrier,
package.
A0 - A14
Address Inputs
Q0 - Q7
Data Outputs
E
Chip Enable
G
Output Enable
ASV
PP
Address Strobe / Program Supply
V
CC
Supply Voltage
V
SS
Ground
Table 1. Signal Names
PLCC32 (C)
1
28
FDIP28W (F)
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參數(shù)描述
87C31X2 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:80C51 8-bit microcontroller family 4K/8K/16K/32K ROM/OTP 128B/256B RAM low voltage 2.7 to 5.5 V, low power, high speed 30/33 MHz
87C32X2 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:80C51 8-bit microcontroller family 4K/8K/16K/32K ROM/OTP 128B/256B RAM low voltage 2.7 to 5.5 V, low power, high speed 30/33 MHz
87C34X2 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:80C51 8-bit microcontroller family 4K/8K/16K/32K ROM/OTP 128B/256B RAM low voltage 2.7 to 5.5 V, low power, high speed 30/33 MHz
87C38X2 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:80C51 8-bit microcontroller family 4K/8K/16K/32K ROM/OTP 128B/256B RAM low voltage 2.7 to 5.5 V, low power, high speed 30/33 MHz
87C451 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:80C51 8-bit microcontroller family 4K/128 OTP/ROM/ROMless, expanded I/O
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