2764A 반도체 회로 부품 판매점
64K (8K x 8) UV EPROM and OTP ROM
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 STMicroelectronics |
M27C64A
64K (8K x 8) UV EPROM and OTP ROM
VERY FAST ACCESS TIME: 150ns
COMPATIBLE with HIGH SPEED
MICROPROCESSORS, ZERO WAIT STATE
LOW POWER “CMOS” CONSUMPTION:
– Active Current 30mA
– Standby Current 100µA
PROGRAMMING VOLTAGE: 12.5V
ELECTRONIC SIGNATURE for AUTOMATED
PROGRAMMING
HIGH SPEED PROGRAMMING
(less than 1 minute)
28
1
FDIP28W (F)
PLCC32 (C)
DESCRIPTION
The M27C64A is a high speed 65,536 bit UV eras-
able and electrically programmable memory
EPROM ideally suited for microprocessor systems
requiring large programs. It is organized as 8,192
by 8 bits.
The 28 pin Window Ceramic Frit-Seal Dual-in-Line
package has transparent lid which allows the user
to expose the chip to ultraviolet light to erase the
bit pattern. Anew pattern can then be written to the
device by following the programming procedure.
For applications where the content is programmed
only on time and erasure is not required, the
M27C64A is offered in Plastic Leaded Chip Carrier
package.
Figure 1. Logic Diagram
VCC VPP
13
A0-A12
8
Q0-Q7
Table 1. Signal Names
A0 - A12
Q0 - Q7
E
G
P
VPP
VCC
VSS
Address Inputs
Data Outputs
Chip Enable
Output Enable
Program
Program Supply
Supply Voltage
Ground
P M27C64A
E
G
VSS
AI00834B
March 1995
1/11
M27C64A
Figure 2A. DIP Pin Connections
Figure 2B. LCC Pin Connections
VPP
A12
A7
A6
A5
A4
A3
A2
A1
A0
Q0
Q1
Q2
VSS
1 28 VCC
2 27 P
3 26 NC
4 25 A8
5 24 A9
6 23 A11
7 22
M27C64A
8 21
9 20
10 19
11 18
12 17
13 16
14 15
G
A10
E
Q7
Q6
Q5
Q4
Q3
AI00835
A6
A5
A4
A3
A2 9
A1
A0
NC
Q0
1 32
M27C64A
17
A8
A9
A11
NC
25 G
A10
E
Q7
Q6
AI00836
Warning: NC = Not Connected
Warning: NC = Not Connected, DU = Don’t Use
Table 2. Absolute Maximum Ratings (1)
Symbol
Parameter
Value
Unit
TA Ambient Operating Temperature
–40 to 125
°C
TBIAS
Temperature Under Bias
–50 to 125
°C
TSTG
Storage Temperature
–65 to 150
°C
VIO (2)
Input or Output Voltages (except A9)
–2 to 7
V
VCC
VA9 (2)
Supply Voltage
A9 Voltage
–2 to 7
–2 to 13.5
V
V
VPP Program Supply Voltage
–2 to 14
V
Notes: 1. Except for the rating ”Operating Temperature Range”, stresses above those listed in the Table ”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 specification is not implied. Exposure to Absolute Maximum
Rating conditions for extended periods may affect device reliability. Refer also to the SGS-THOMSON SURE Program and other
relevant quality documents.
2. Minimum DC voltage on Input or Output is –0.5V with possible undershoot to –2.0V for a period less than 20ns. Maximum DC
voltage on Output is VCC +0.5V with possible overshoot to VCC +2V for a period less than 20ns.
DEVICE OPERATION
The modes of operation of the M27C64A are listed
in the Operating Modes table. A single 5V power
supply is required in the read mode. All inputs are
TTL levels except for VPP and 12V on A9 for Elec-
tronic Signature.
Read Mode
The M27C64A has two control functions, both of
which must be logically active in order to obtain
data at the outputs. Chip Enable (E) is the power
control and should be used for device selection.
Output Enable (G) is the output control and should
2/11
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관련 데이터시트
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64K (8K x 8) UV EPROM and OTP ROM - STMicroelectronics
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