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FINAL
Am27C4096
4 Megabit (256 K x 16-Bit) CMOS EPROM
DISTINCTIVE CHARACTERISTICS
s Fast access time
— Speed options as fast as 90 ns
s Low power consumption
— 100 µA maximum CMOS standby current
s JEDEC-approved pinout
— Plug-in upgrade of 1 Mbit and 2 Mbit EPROMs
— 40-pin DIP/PDIP
— 44-pin PLCC
s Single +5 V power supply
s ±10% power supply tolerance standard
s 100% Flashrite programming
— Typical programming time of 32 seconds
s Latch-up protected to 100 mA from –1 V to
VCC + 1 V
s High noise immunity
GENERAL DESCRIPTION
The Am27C4096 is a 4 Mbit, ultraviolet erasable pro-
grammable read-only memory. It is organized as 256
Kwords, operates from a single +5 V supply, has a
static standby mode, and features fast single address
location programming. The Am27C4096 is ideal for use
in 16-bit microprocessor systems. The device is avail-
able in windowed ceramic DIP packages, and plastic
one time programmable (OTP) PDIP and PLCC pack-
ages.
Data can be typically accessed in less than 90 ns, al-
lowing high-performance microprocessors to operate
without any WAIT states. The device offers separate
Output Enable (OE#) and Chip Enable (CE#) controls,
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 125 mW in active mode,
and 125 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 32 seconds.
BLOCK DIAGRAM
OE#
CE#/PGM#
A0–A17
Address
Inputs
VCC
VSS
VPP
Output Enable
Chip Enable
and
Prog Logic
Y
Decoder
X
Decoder
Data Outputs
DQ0–DQ15
Output
Buffers
Y
Gating
4,194,304
Bit Cell
Matrix
11408F-1
Publication# 11408 Rev: F Amendment/0
Issue Date: May 1998

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PRODUCT SELECTOR GUIDE
Family Part Number
Speed Options
Max Access Time (ns)
CE# (E#) Access (ns)
OE# (G#) Access (ns)
VCC = 5.0 V ± 5%
VCC = 5.0 V ± 10%
CONNECTION DIAGRAMS
Top View
DIP
-95
90
90
50
VPP
CE# (E#)/PGM# (P#)
DQ15
DQ14
DQ13
DQ12
DQ11
DQ10
DQ9
DQ8
VSS
DQ7
DQ6
DQ5
DQ4
DQ3
DQ2
DQ1
DQ0
OE# (G#)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
40 VCC
39 A17
38 A16
37 A15
36 A14
35 A13
34 A12
33 A11
32 A10
31 A9
30 VSS
29 A8
28 A7
27 A6
26 A5
25 A4
24 A3
23 A2
22 A1
21 A0
Notes:
1. JEDEC nomenclature is in parenthesis.
2. Don’t use (DU) for PLCC.
11408F-2
-105
-100
100
100
50
Am27C4096
-120
120
120
50
-150
150
150
65
-200
200
200
75
-255
250
250
75
PLCC
DQ12
DQ11
DQ10
DQ9
DQ8
VSS
NC
DQ7
DQ6
DQ5
DQ4
6 5 4 3 2 1 44 43 42 41 40
7 39
8 38
9 37
10 36
11 35
12 34
13 33
14 32
15 31
16 30
17 29
18 19 20 21 22 23 24 25 26 27 28
A13
A12
A11
A10
A9
VSS
NC
A8
A7
A6
A5
11408F-3
PIN DESIGNATIONS
A0–A17 = Address Inputs
CE# (E#)/ = Chip Enable Input/
PGM#/ (P#) Program Enable Input
DQ0–DQ15 = Data Input/Outputs
OE# (G#) = Output Enable Input
VCC = VCC Supply Voltage
VPP = Program Voltage Input
VSS = Ground
LOGIC SYMBOL
18
A0–A17
DQ0–DQ15
CE# (E#)/PGM# (P#)
16
OE# (G#)
11408F-4
2 Am27C4096

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ORDERING INFORMATION
UV EPROM Products
AMD standard products are available in several packages and operating ranges. The order number (Valid Combination) is formed
by a combination of the following:
AM27C4096
-95 D C B
OPTIONAL PROCESSING
Blank = Standard Processing
B = Burn-In
TEMPERATURE RANGE
C = Commercial (0°C to +70°C)
I = Industrial (–40°C to +85°C)
E = Extended (–55°C to +125°C)
PACKAGE TYPE
D = 40-Pin Ceramic DIP (CDV040)
SPEED OPTION
See Product Selector Guide and
Valid Combinations
DEVICE NUMBER/DESCRIPTION
Am27C4096
4 Megabit (256 K x 16-Bit) CMOS UV EPROM
Valid Combinations
AM27C4096-95
VCC = 5.0 V ± 5%
AM27C4096-100
AM27C4096-105
VCC = 5.0 V ± 5%
AM27C4096-120
DC, DCB
DC, DCB, DI, DIB
AM27C4096-150
DC, DCB, DE, DEB, DI, DIB
AM27C4096-200
AM27C4096-255
VCC = 5.0 V ± 5%
DC, DCB, DI, DIB
Valid Combinations
Valid Combinations list configurations planned to be sup-
ported in volume for this device. Consult the local AMD sales
office to confirm availability of specific valid combinations and
to check on newly released combinations.
Am27C4096
3

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ORDERING INFORMATION
OTP EPROM Products
AMD standard products are available in several packages and operating ranges. The order number (Valid Combination) is formed
by a combination of the following:
AM27C4096
-105
P
C
OPTIONAL PROCESSING
Blank = Standard Processing
TEMPERATURE RANGE
C = Commercial (0°C to +70°C)
I = Industrial (–40°C to +85°C)
PACKAGE TYPE
P = 40-Pin Plastic DIP (PD 040)
J = 44-Pin Plastic Leaded Chip Carrier (PL 044)
SPEED OPTION
See Product Selector Guide and
Valid Combinations
DEVICE NUMBER/DESCRIPTION
Am27C4096
4 Megabit (256 K x 16-Bit) CMOS OTP EPROM
Valid Combinations
AM27C4096-105
VCC = 5.0 V ± 5%
AM27C4096-120
PC, JC
AM27C4096-150
AM27C4096-200
PC, PI, JC, JI
AM27C4096-255
VCC = 5.0 V ± 5%
Valid Combinations
Valid Combinations list configurations planned to be sup-
ported in volume for this device. Consult the local AMD sales
office to confirm availability of specific valid combinations and
to check on newly released combinations.
4 Am27C4096

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FUNCTIONAL DESCRIPTION
Device Erasure
In order to clear all locations of their programmed con-
tents, the device must be exposed to an ultraviolet light
source. A dosage of 15 W seconds/cm2 is required to
completely erase the device. This dosage can be ob-
tained by exposure to an ultraviolet lamp—wavelength
of 2537 Å—with intensity of 12,000 µW/cm2 for 15 to 20
minutes. The device should be directly under and about
one inch from the source, and all filters should be re-
moved from the UV light source prior to erasure.
Note that all UV erasable devices will erase with light
sources having wavelengths shorter than 4000 Å, such
as fluorescent light and sunlight. Although the erasure
process happens over a much longer time period, ex-
posure to any light source should be prevented for
maximum system reliability. Simply cover the package
window with an opaque label or substance.
Device Programming
Upon delivery, or after each erasure, the device has
all of its bits in the “ONE”, or HIGH state. “ZEROs” are
loaded into the device through the programming pro-
cedure.
The device enters the programming mode when 12.75
V ± 0.25 V is applied to the VPP pin, and CE#/PGM# is
at VIL and OE# is at VIH.
For programming, the data to be programmed is ap-
plied 16 bits in parallel to the data pins.
The flowchart in the Programming section (Section 5,
Figure 5-1) shows AMD’s Flashrite algorithm. The
Flashrite algorithm reduces programming time by using
a 100 µs programming pulse and by giving each address
only as many pulses to reliably program the data. After
each pulse is applied to a given address, the data in that
address is verified. If the data does not verify, additional
pulses are given until it verifies or the maximum pulses
allowed is reached. This process is repeated while se-
quencing through each address of the device. This part
of the algorithm is done at VCC = 6.25 V to assure that
each EPROM bit is programmed to a sufficiently high
threshold voltage. After the final address is completed,
the entire EPROM memory is verified at VCC = VPP =
5.25 V.
Please refer to Section 5 for additional programming in-
formation and specifications.
Program Inhibit
Programming different data to multiple devices in par-
allel is easily accomplished. Except for CE#/PGM#, all
like inputs of the devices may be common. A TTL
low-level program pulse applied to one device’s CE#/
PGM# input with VPP = 12.75 V ± 0.25 V and OE#
HIGH will program that particular device. A high-level
CE#/PGM# input inhibits the other devices from being
programmed.
Program Verify
A verification should be performed on the programmed
bits to determine that they were correctly programmed.
The verify should be performed with OE# at VIL, CE#/
PGM# at VIH, and VPP between 12.5 V and 13.0 V.
Autoselect Mode
The autoselect mode provides manufacturer and de-
vice identification through identifier codes on DQ0–
DQ7. This mode is primarily intended for programming
equipment to automatically match a device to be pro-
grammed with its corresponding programming algo-
rithm. This mode is functional in the 25°C ± 5°C
ambient temperature range that is required when pro-
gramming the device.
To activate this mode, the programming equipment
must force VH on address line A9. Two identifier bytes
may then be sequenced from the device outputs by tog-
gling address line A0 from VIL to VIH (that is, changing
the address from 00h to 01h). All other address lines
must be held at VIL during the autoselect mode.
Byte 0 (A0 = VIL) represents the manufacturer code,
and Byte 1 (A0 = VIH), the device identifier code. Both
codes have odd parity, with DQ7 as the parity bit.
Read Mode
To obtain data at the device outputs, Chip Enable (CE#/
PGM#) and Output Enable (OE#) must be driven low.
CE#/PGM# controls the power to the device and is typ-
ically used to select the device. OE# enables the device
to output data, independent of device selection. Ad-
dresses must be stable for at least tACC–tOE. Refer to
the Switching Waveforms section for the timing dia-
gram.
Standby Mode
The device enters the CMOS standby mode when
CE#/PGM# is at VCC ± 0.3 V. Maximum VCC current is
reduced to 100 µA. The device enters the TTL-standby
mode when CE#/PGM# is at VIH. Maximum VCC cur-
rent is reduced to 1.0 mA. When in either standby
mode, the device places its outputs in a high-imped-
ance state, independent of the OE# input.
Output OR-Tieing
To accommodate multiple memory connections, a
two-line control function provides:
s low memory power dissipation, and
s assurance that output bus contention will not occur.
CE#/PGM# should be decoded and used as the pri-
mary device-selecting function, while OE# be made a
Am27C4096
5