OTP EPROM 2Mbit (256K x 8-bit)
AF27C020 (preliminary)
Features:
•
•
•
•
•
•
•
256K x 8 organization
Single +5V VCC power supply
±
10%
power supply tolerance standard
Programming voltage of +12.75V
±
0.25V
Fast access time: 70/90/120/150ns
All inputs and outputs TTL compatible
Current:
o
Operating: 30mA (max.) at 5MHz
o
Standby: 100µA (max.)
Package type:
o
32 pin plastic DIP
o
32 pin SOP
o
32 pin PLCC
o
32 pin TSOP
Compatible with JEDEC standard
Pin Configuration
PDIP/SOP
•
TSOP
General Description:
Aplus’ AF27C020 is a high-performance 2Mbit
One-Time-Programmable Read Only Memory.
It is organized as 256K by 8 bits, operates from
a single +5V VCC power supply and has all TTL
compatible input and output signals. It also has
static standby mode and features very fast
single address location programming. For
programming outside the system, existing
EPROM programmers may be used, as it
supports a fast programming algorithm time of
less than one minute.
PLCC
Block Diagram:
Preliminary
Aplus Flash Technology, Inc.
Page 1
6/4/2003
AF27C020
Functional Description
Read Mode
The AF27C020 has two control functions, both
of which must be logically active in order to
obtain data at the outputs. Chip Enable (CE#) is
the power control and should be used for device
selection. Output Enable (OE#) is the output
control and should be used to gate data to the
output pins, independent of device selection.
Assuming that the addresses are stable, the
address access time (tACC) is equal to the
delay from CE# to output (tCE). Data is
available at the output after the falling edge of
OE#, assuming that CE# has been LOW and
addresses have been stable for at least tACC –
tOE.
Standby Mode
The AF27C020 reduces the active current from
30mA to 100µA in its standby mode. It is placed
in CMOS standby when CE# is at VCC± 0.3V. It
also has a TTL-standby mode that reduces the
maximum VCC current to 1mA. The AF27C020
is placed in standby mode by applying a CMOS
high signal to CE#. When in standby mode, the
output is in a high impedance state, independent
of the OE# input.
Auto Identify Mode
The auto identify mode allows reading out of a
binary code from an EPROM that will identify its
manufacturer and device type. It is intended for
programming equipment use by automatically
matching the device to be programmed with its
corresponding programming algorithm. This
mode is functional in ambient temperature
ranges from 25°C
±
5°C.
To activate this mode, the programming
equipment must apply voltages of 12V
±
0.5V on
the address line A9 of the device. Two
identification codes can be read from data
output pin by toggling A0, when A1=V
IH
. The
other addresses must be held at V
IL
during this
mode. Byte 0 (A0 = V
IL
, A1 = V
IL
) & Byte 1 (A0=
V
IH
, A1=V
IL
) represent the continuation code.
Byte 2 (A0 = V
IL
, A1 = V
IH
) & Byte 3 (A0= V
IH
,
A1=V
IH
) represent the manufacturer code and
device code, which are 26H and TBD
respectively. All identifiers for these codes will
possess odd parity, with MSB (IO7) defined as
the parity bit.
Absolute Maximum Ratings
RATING
Ambient Operating
Temperature
Storage Temperature
Applied Input Voltage
Applied Output Voltage
VCC to Ground
Potential
A9 & VPP
VALUE
-40°C to 85°C
-65°C to 125°C
-0.5V to 7.0V
-0.5V to VCC +0.5V
-0.5V to 7.0V
-0.5V to 13V
Notice: Stresses greater than those listed under
ABSOLUTE MAXIMUM RATINGS may cause
permanent damage to the device. These are stress
ratings only and operation of the device at these or
any other conditions above those indicated in the
Operating sections of this datasheet is not implied.
Exposure to the absolute maximum rating conditions
for extended periods may affect device reliability.
Preliminary
Page 3
6/4/2003
Aplus Flash Technology, Inc.
Aplus reserves the right to change product and specifications without prior notice.
AF27C020
Table 3
Read Mode DC Electrical Characteristics (Ta = 0ºC to 70ºC, VCC = 5V ± 10%, VPP = VCC)
Symbol Parameter
Min.
Max.
Unit
Conditions
V
OH
V
OL
V
IH
V
IL
I
LI
I
LO
I
CC
Output High Voltage
Output Low Voltage
Input High Voltage
Input Low Voltage
Input Leakage Current
Output Leakage Current
VCC Read Operating Current
2.4
2.0
-0.3
-10
-10
0.4
VCC+0.5
0.8
+10
+10
30
V
V
V
V
µA
µA
mA
I
OH
= -400µA
I
OL
= 2.1mA
I
SB
I
SB
1
VCC Standby Current (TTL)
VCC Standby Current (CMOS)
(Note: In the min column 10µA is typical, not
minimum. Isb1 specifications are at Vdd = 5.5V
@ 85ºC.)
VPP Current During Read
A9 Auto Select Current
10
1
100
mA
µA
VCC = max.
V
IN
= 0V to VCC
VCC = max.
Vout = 0V to VCC
VCC = max.
CE# = V
IL
, OE# =
V
I
H, I
OUT
= 0mA,
at 5MH
Z
VCC = max.
CE# = V
IH
VCC = max.
CE# = VCC –0.2V
I
PP
I
ID
10
100
µA
µA
CE# = OE# = V
IL
VPP = VCC
A9 = V
ID
VCC = max.
Capacitance (Ta = 25ºC, f = 1.0MHz)
Symbol Parameter
C
IN
Input Capacitance
C
OUT
Output Capacitance
* These parameters are sampled and not 100% tested.
Min.
Max.
6
12
Unit
pF
pF
Conditions
V
IN
= 0V
V
OUT
= 0V
Preliminary
Page 4
6/4/2003
Aplus Flash Technology, Inc.
Aplus reserves the right to change product and specifications without prior notice.
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