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AT27C256 PDF预览

AT27C256

更新时间: 2022-12-13 15:45:11
品牌 Logo 应用领域
爱特美尔 - ATMEL 可编程只读存储器电动程控只读存储器
页数 文件大小 规格书
9页 254K
描述
256K 32K x 8 OTP CMOS EPROM

AT27C256 数据手册

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AT27C256R  
AC Waveforms for Read Operation (1)  
Notes: 1. Timing measurement reference level is 1.5V for -45  
and -55 devices. Input AC drive levels are VIL =  
3. OE may be delayed up to tACC - tOE after the address is valid  
without impact on tACC  
.
0.0V and VIH = 3.0V. Timing measurement refer-  
4. This parameter is only sampled and is not 100% tested.  
5. Output float is defined as the point when data is no longer  
driven.  
ence levels for all other speed grades are VOL  
=
0.8V and VOH = 2.0V. Input AC drive levels are VIL  
= 0.45V and VIH = 2.4V.  
2. OE may be delayed up to tCE - tOE after the falling  
edge of CE without impact on tCE  
.
Input Test Waveforms and Measurement Levels  
Output Test Load  
For -45 and -55 devices only:  
tR, tF < 5 ns (10% to 90%)  
For -70, -90, -12, and -15 devices:  
Note:  
CL= 100 pF including jig  
capacitance, except for  
the -45 and -55 devices,  
where CL= 30 pF.  
tR, tF < 20 ns (10% to 90%)  
Pin Capacitance (f = 1MHz, T = 25°C) (1)  
Typ  
4
Max  
6
Units  
pF  
Conditions  
C
C
V
V
= 0V  
IN  
IN  
8
12  
pF  
= 0V  
OUT  
OUT  
Note: 1. Typical values for nominal supply voltage. This parameter is only sampled and is not 100% tested.  
3-129  

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