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Features

• Fast read access time – 55ns

• Low-power CMOS operation

– 100µA max standby

– 35mA max active at 5MHz

• JEDEC standard packages

– 44-lead PLCC

• Direct upgrade from 512Kbit and 1Mbit (Atmel

AT27C516 and AT27C1024)

EPROMs

• 5V  10% supply

• High-reliability CMOS technology

– 2,000V ESD protection

– 200mA latchup immunity

• Rapid

programming algorithm – 50µs/word (typical)

• CMOS- and TTL-compatible inputs and outputs

• Integrated product identification code

• Industrial temperature range

1. Description

The Atmel AT27C2048 is a low-power, high-performance 2,097,152-bit, one-time pro-

grammable, read-only memory (OTP EPROM) organized as 128K by 16 bits. It requires a

single 5V power supply in normal read mode operation. Any word can be accessed in less

than 55 ns, eliminating the need for speed-reducing WAIT states. The x16 organization

makes this part ideal for high-performance, 16- and 32-bit microprocessor systems.

In read mode, the AT27C2048 typically consumes 15mA. Standby mode supply current is

typically less than 10µA

The AT27C2048 is available in an industry-standard, JEDEC-approved, one-time program-

mable (OTP) PLCC package. The device features two-line control (CE, OE) to eliminate

bus contention in high-speed systems.

With high-density, 128K word storage capability, the AT27C2048 allows firmware to be

stored reliably and to be accessed by the system without the delays of mass storage media.

The AT27C2048 has additional features that ensure high quality and efficient production

use. The rapid

programming algorithm reduces the time required to program the part and

guarantees reliable programming. Programming time is typically only 50 µs/word. The Inte-

grated product identification code electronically identifies the device and manufacturer. This

feature is used by industry-standard programming equipment to select the proper pro-

gramming algorithms and voltages.

2Mb (128K x 16)

One-time

Programmable,

Read-only Memory

Atmel AT27C2048

0632G–EPROM–4/11

快速读取访问时间 - 55纳秒

低功耗CMOS操作 – 最大100µ

A待机 – 5MHz时最大35mA激

活

JEDEC标准封装 – 44引

脚PLCC

直接从512Kbit和1Mbit (Atmel

AT27C516和AT27C1024）EPROM升级

高可靠性CMOS技术 – 2,000V静

电放电保护 – 200mA闩锁免疫

快速编程算法 – 50µs/字（典型）

与CMOS和TTL兼容的输入和输出

集成产品识别码

工业温度范围

Atmel AT27C2048 是一款低功耗、高性能的 2,097,152 位一次性可编程只读存储器（OT

P EPROM），其结构为 128K x 16 位。在正常读取模式下，仅需一个 5V 电源供电。任何

字可以在不到 55 纳秒的时间内被访问，消除了降低速度的 WAIT 状态需求。其 x16 的组

织结构使其非常适合用于高性能的 16 位和 32 位微处理器系统。

在读取模式下，AT27C2048 通常消耗 15mA 的电流。待机模式下的供电电流通常小于 10

µA。

AT27C2048采用行业标准、JEDEC认证的一次性可编程（OTP）PLCC封装。该器件具

有两线控制（CE，OE），可消除高速系统中的总线竞争。

凭借高密度、128K字的存储能力，AT27C2048可以可靠地存储固件，并且系统可以访问

它，而不会出现大规模存储介质的延迟。

AT27C2048具有确保高质量和高效生产使用的附加功能。快速编程算法减少了对部件进行

编程所需的时间，并保证可靠的编程。典型的编程时间仅为每字50微秒。集成的产品识别

码可以电子方式识别设备和制造商。此功能被行业标准编程设备使用，以选择适当的编程

算法和电压。

翻译仅供参考，如需更精准的信息，请参阅英文版。

0632G–EPROM–4/11

Atmel AT27C2048

2. Pin configurations

Note: Both GND pins must be

connected.

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 nonconformance.

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

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

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

Pin name Function

A0 - A16 Addresses

O0 - O15 Outputs

CE Chip enable

OE Output enable

PGM Program strobe

NC No connect

DC Don’t connect

O12

O11

O10

GND

A13

A12

A11

A10

GND

O13

O14

O15

VPP

VCC

PGM

A16

A15

A14

44-

PLCC

Top view

Note: PLCC package pins 1 and 23 are “don’t

connect.”

GND

VPP

VCC

DATA OUTPUTS

O0 - O15

OE, CE AND

PROGRAM LOGIC

Y DECODER

X DECODER

OUTPUT

BUFFERS

Y-GATING

CELL MATRIX

IDENTIFICATION

A0 - A17

ADDRESS

INPUTS

两个GND引脚必须连接

。

通过芯片启用引脚在活动和备用状态之间切换可能会产生瞬态电压波动。除非系统设计能够适应这些瞬态变化，否则它

们可能会超过数据手册的限制，导致设备不符合规格。至少，每个设备应使用一个0.1µF、高频、低固有电感的陶瓷电容

器。此电容器应连接在设备的 V

和地端子之间，并尽可能靠近设备。此外，为了稳定带有大型EPROM阵列的印刷电路

板上的供电电压水平，应使用4.7µF的大容量电解电容器，再次连接在 V

和地端子之间。此电容器应尽可能靠近电源连

接到阵列的位置放置。

PLCC封装的引脚1和23为“不连接”。

0632G–EPROM–4/11

Atmel AT27C2048

4. Absolute maximum ratings*

Note: 1. Maximum voltage is -0.6V DC, which may undershoot to -2.0V for pulses of less than 20ns. Maximum output pin voltage is

+ 0.75V DC, which may overshoot to +7.0V for pulses of less than 20ns.

5. DC and AC characteristics

Table 5-1. Operating modes

Notes: 1. X can be V

or V

2. Refer to the programming characteristics.

3. V

= 12.0  0.5V.

4. Two identifier words may be selected. All Ai inputs are held low (V

), except A9, which is set to V

, and A0, which is tog-

gled low (V

) to select the manufacturer’s identification word and high (V

) to select the device code word.

5. Standby V

current (I

) is specified with V

= V

. V

> V

will cause a slight increase in I

Table 5-2. DC and AC operating conditions for read operation

Temperature under bias . . . . . . . . . . . . . -55C to +125C

Storage temperature . . . . . . . . . . . . . . . . -65C to +150C

Voltage on any pin with

respect to ground . . . . . . . . . . . . . . . . . . . -2.0V to +7.0V

(1)

Voltage on A9 with

respect to ground . . . . . . . . . . . . . . . . . -2.0V to +14.0V

(1)

supply voltage with

respect to ground . . . . . . . . . . . . . . . . . . -2.0V to +14.0V

(1)

*NOTICE: Stresses beyond those listed under “Absolute maximum

ratings” may cause permanent damage to the device. This

is a stress rating only, and functional operation of the

device at these or any other conditions beyond those

indicated in the operational sections of this specification is

not implied. Exposure to absolute maximum rating

conditions for extended periods may affect device reliability.

Mode/Pin CE OE PGM Ai V

Outputs

Read V

(1)

Ai X

(1)

OUT

Output disable X V

X X X High Z

Standby V

XX X X

(5)

High Z

Rapid program

(2)

Ai V

PGM verify V

Ai V

OUT

PGM inhibit V

XX X V

High Z

Product identification

(4)

A9 = V

(3)

A0 = V

or V

A1 - A16 = V

Identification code

Atmel AT27C2048

-55 -90

Industrial operating temperature (case) -40C - 85C -40C - 85C

power supply 5V  10% 5V  10%

绝对最大额定值*

最大电压为-0.6V DC，对于小于20ns的脉冲，可能下冲至-2.0V。最大输出引脚电压为 V

+ 0.75V DC，对于小于20ns的

脉冲，可能上冲至+7.0V。

直流和交流特性

参考编程特性。

可以选取两个标识符单词。除了A9（设置为 (V

）和A0（切换为低电平 V

以选择制造商标识符单词，高电平 (V

以选择

设备代码单词）外，所有Ai输入均保持低电平 (V

。

备用V

当前(I

) 用 V

= V

指定。 V

> V

将导致 I

略有增加。

读操作的直流和交流工作条件

偏置下的温度……… -55°C 到 +125°C 存储温度………

…… -65°C 到 +150°C 任意引脚上的电压

相对于地. . . . . . . . . . . . . . . . . . . -2.0V至+7.0V

(1)

相对于地 . . . . . . . . . . . . . . . . .-2.0V到+14.0V

(1)

相对于地. . . . . . . . . . . . . . . . .-2.0V到+14.0V

(1)

超出“绝对最大额定值”下所列的应力可能会导致设备永久

损坏。这仅是应力评级，设备在这些条件或任何其他超出

本规范操作部分中指示条件下的功能运行并不被暗示。长

时间暴露在绝对最大额定条件可能会影响设备的可靠性。

工业工作温度（外壳）

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