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2.
Pin configurations
Pin name
A0 - A14
Function
Addresses
32-lead PLCC
Top view
28-lead PDIP
Top view
O0 - O7
Outputs
VPP
1
28
VCC
CE
OE
NC
Chip enable
Output enable
No connect
A6
A5
A4
A3
A2
A1
A0
NC
O0
5
6
7
8
9
10
11
12
13
29
28
27
26
25
24
23
22
21
A8
A9
A11
NC
OE
A1 0
CE
O7
O6
A12
A7
A6
A5
A4
A3
A2
A1
A0
O0
2
3
4
5
6
7
8
9
10
11
27
26
25
24
23
22
21
20
19
18
A14
A13
A8
A9
A1 1
OE
A1 0
CE
O7
O6
Note:
PLCC package pins 1
O1
O2
GND
12
13
14
17
16
15
O5
O4
O3
and 17 are “don’t
connect”
3.
System considerations
Switching between active and standby conditions via the chip enable pin may produce transient voltage excursions. Unless
accommodated by the system design, these transients may exceed datasheet limits, resulting in device non-conformance.
At a minimum, a 0.1μF, high-frequency, low inherent inductance, ceramic capacitor should be utilized for each device. This
capacitor should be connected between the V CC and ground terminals of the device, as close to the device as possible.
Additionally, to stabilize the supply voltage level on printed circuit boards with large EPROM arrays, a 4.7μF bulk electrolytic
capacitor should be utilized, again connected between the V CC and ground terminals. This capacitor should be positioned as
close as possible to the point where the power supply is connected to the array.
Figure 3-1.
Block diagram
2
Atmel AT27C256R
0014O–EPROM–10/11
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相关代理商/技术参数
AT27C256R-45RC
功能描述:IC OTP 256KBIT 45NS 28SOIC RoHS:否 类别:集成电路 (IC) >> 存储器 系列:- 标准包装:32 系列:- 格式 - 存储器:闪存 存储器类型:FLASH 存储容量:1M (128K x 8) 速度:120ns 接口:并联 电源电压:2.7 V ~ 3.6 V 工作温度:0°C ~ 70°C 封装/外壳:32-LCC（J 形引线） 供应商设备封装:32-PLCC 包装:管件 其它名称:AT49BV00112JC
AT27C256R-45RI
功能描述:可擦除可编程ROM 256Kb (32Kx8) OTP 5V 45ns RoHS:否 制造商:Maxim Integrated 类型: 存储容量:1024 bit 组织:1 K x 1 接口类型: 工作电流:5 uA 编程电压: 工作电源电压:2.8 V to 6 V 最大工作温度:+ 85 C 安装风格:Through Hole 封装 / 箱体:TO-92
AT27C256R-45RU
功能描述:可擦除可编程ROM 256Kb (32Kx8) OTP 5V 45ns RoHS:否 制造商:Maxim Integrated 类型: 存储容量:1024 bit 组织:1 K x 1 接口类型: 工作电流:5 uA 编程电压: 工作电源电压:2.8 V to 6 V 最大工作温度:+ 85 C 安装风格:Through Hole 封装 / 箱体:TO-92
AT27C256R-45TC
功能描述:可擦除可编程ROM 256k bit RoHS:否 制造商:Maxim Integrated 类型: 存储容量:1024 bit 组织:1 K x 1 接口类型: 工作电流:5 uA 编程电压: 工作电源电压:2.8 V to 6 V 最大工作温度:+ 85 C 安装风格:Through Hole 封装 / 箱体:TO-92
AT27C256R-45TI
功能描述:可擦除可编程ROM 256Kb (32Kx8) OTP 5V 45ns RoHS:否 制造商:Maxim Integrated 类型: 存储容量:1024 bit 组织:1 K x 1 接口类型: 工作电流:5 uA 编程电压: 工作电源电压:2.8 V to 6 V 最大工作温度:+ 85 C 安装风格:Through Hole 封装 / 箱体:TO-92
AT27C256R-45TU
功能描述:可擦除可编程ROM 256Kb (32Kx8) OTP 5V 45ns RoHS:否 制造商:Maxim Integrated 类型: 存储容量:1024 bit 组织:1 K x 1 接口类型: 工作电流:5 uA 编程电压: 工作电源电压:2.8 V to 6 V 最大工作温度:+ 85 C 安装风格:Through Hole 封装 / 箱体:TO-92
AT27C256R-55
制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:256K 32K x 8 OTP CMOS EPROM
AT27C256R-55DC
制造商:未知厂家 制造商全称:未知厂家 功能描述:x8 EPROM