AM27C256-150DC Advanced Micro Devices, AM27C256-150DC Datasheet

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AM27C256-150DC

Manufacturer Part Number
AM27C256-150DC
Description
256 kilobit CMOS EPROM
Manufacturer
Advanced Micro Devices
Datasheet

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Am27C256
256 Kilobit (32 K x 8-Bit) CMOS EPROM
DISTINCTIVE CHARACTERISTICS
GENERAL DESCRIPTION
The Am27C256 is a 256-Kbit, ultraviolet erasable pro-
grammable read-only memory. It is organized as 32K
words by 8 bits per word, operates from a single +5 V
supply, has a static standby mode, and features fast
single address location programming. Products are
available in windowed ceramic DIP packages, as well
as plastic one time programmable (OTP) PDIP and
PLCC packages.
Data can be typically accessed in less than 55 ns, al-
lowing high-performance microprocessors to operate
without any WAIT states. The device offers separate
Output Enable (OE#) and Chip Enable (CE#) controls,
BLOCK DIAGRAM
Fast access time
— Speed options as fast as 45 ns
Low power consumption
— 20 µA typical CMOS standby current
JEDEC-approved pinout
Single +5 V power supply
100% Flashrite™ programming
— Typical programming time of 4 seconds
10% power supply tolerance standard
FINAL
Address
A0–A14
Inputs
OE#
CE#
Output Enable
Chip Enable
V
V
V
Prog Logic
Decoder
Decoder
CC
SS
PP
and
Y
X
thus eliminating bus contention in a multiple bus micro-
processor system.
AMD’s CMOS process technology provides high
speed, low power, and high noise immunity. Typical
power consumption is only 80 mW in active mode, and
100 µW in standby mode.
All signals are TTL levels, including programming sig-
nals. Bit locations may be programmed singly, in
blocks, or at random. The device supports AMD’s
Flashrite programming algorithm (100 µs pulses), re-
sulting in a typical programming time of 4 seconds.
Latch-up protected to 100 mA from –1 V to
V
High noise immunity
Versatile features for simple interfacing
— Both CMOS and TTL input/output compatibility
— Two line control functions
Standard 28-pin DIP, PDIP, and 32-pin PLCC
packages
CC
+ 1 V
Data Outputs
DQ0–DQ7
262,144
Buffers
Bit Cell
Output
Gating
Matrix
Y
Publication# 08007
Issue Date: May 1998
Rev: I Amendment/0
08007I-1

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AM27C256-150DC Summary of contents

Page 1

... Flashrite™ programming — Typical programming time of 4 seconds GENERAL DESCRIPTION The Am27C256 is a 256-Kbit, ultraviolet erasable pro- grammable read-only memory organized as 32K words by 8 bits per word, operates from a single +5 V supply, has a static standby mode, and features fast single address location programming ...

Page 2

... No Internal Connection 2 Am27C256 -45 -55 -70 - A14 A6 A13 A11 A2 OE# (G#) A1 A10 A0 CE# (E#) NC DQ7 DQ0 DQ6 DQ5 DQ4 DQ3 08007I-2 LOGIC SYMBOL 15 Am27C256 -120 -150 -200 120 150 200 120 150 200 PLCC A11 OE# (G A10 24 11 CE# (E DQ7 22 13 DQ6 ...

Page 3

... AM27C256 -45 D DEVICE NUMBER/DESCRIPTION Am27C256 256 Kilobit ( 8-Bit) CMOS UV EPROM Valid Combinations AM27C256-45 DC, DCB, DI, DIB AM27C256-55 AM27C256-70 AM27C256-90 AM27C256-120 DC, DCB, DI, DIB, DE, DEB AM27C256-150 AM27C256-200 AM27C256-255 DC, DCB, DI, DIB OPTIONAL PROCESSING Blank = Standard Processing B TEMPERATURE RANGE C = Commercial ( + Industrial (– ...

Page 4

... AMD standard products are available in several packages and operating ranges. The order number (Valid Combination) is formed by a combination of the following: AM27C256 -55 P Valid Combinations AM27C256-55 AM27C256-70 AM27C256-90 AM27C256-120 JC, PC, JI, PI AM27C256-150 AM27C256-200 AM27C256-255 4 C OPTIONAL PROCESSING Blank = Standard Processing TEMPERATURE RANGE C = Commercial ( + Industrial (– +85 C) PACKAGE TYPE P = 28-Pin Plastic DIP (PD 028) ...

Page 5

... To accommodate multiple memory connections, a two-line control function provides: Low memory power dissipation, and Assurance that output bus contention will not occur. CE# should be decoded and used as the primary de- vice-selecting function, while OE# be made a common Am27C256 0.25 V and OE# HIGH will program , CE address line A9. Two identifier bytes to V ...

Page 6

... V and V CC tion of the capacitor should be close to where the power supply is connected to the array. CE voltage during programming. PP Am27C256 for each eight devices. The loca Outputs OUT X X High High High OUT X V High 01h 10h H ...

Page 7

... Extended (E) Devices + 0.6 V Ambient Temperature (T CC Supply Read Voltages V for ± 5% devices . . . . . . . . . . +4. +5. for ± 10% devices . . . . . . . . . +4. +5. Operating ranges define those limits between which the func- tionality of the device is guaranteed. to –2 2.0 V for periods up to –2.0 V for SS Am27C256 ) . . . . . . . . . . . + .– + .– +125 ...

Page 8

... CE and removed simultaneously or after 0.5 V, which may overshoot –75 –50 – 08007I-5 Figure 2. Typical Supply Current vs. Temperature Am27C256 Min Max 2.4 0.45 2 0.5 CC –0.5 +0.8 1.0 C/I Devices 1.0 E Devices 5.0 25 1.0 100 100 applied 2.0 V for periods less than 20 ns. ...

Page 9

... V 1.5 V 0.45 V Output Note: For C L INPUTS Steady Changing from Changing from Does Not Apply Center Line is High Impedance State (High Z) Am27C256 -45, -55 All and -70 others 1 TTL gate L 30 100 20 0.0–3.0 0.45–2.4 1.5 0.8, 2.0 1 ...

Page 10

... IL Max 25 Min 0 , and removed simultaneously or after V PP 2.0 Addresses Valid 0 ACC (Note 1) after the falling edge of the addresses without impact CDV028 Test Conditions Typ OUT Am27C256 Am27C256 -55 -70 -90 -120 -150 -200 -255 120 150 200 250 120 150 200 250 ...

Page 11

... BSC SIDE VIEW 15 .530 .580 14 SEATING PLANE .015 .014 .060 .022 Am27C256 DATUM D .700 CENTER PLANE MAX 94 105 .300 BSC .600 BSC END VIEW 16-000038H-3 CDV028 DF10 3-30-95 ae .600 .625 .008 .015 ...

Page 12

... SEATING PLANE .013 .021 .050 REF. Ordering Information UV EPROM Products: Added the AM27C256-45 Valid Combination. Test Conditions Table 1. Test Specifications: Added the -45 speed op- tion. AC Characteristics Added the -45 speed option. Am27C256 .042 .056 .400 REF. .490 ...

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