M27C64A
M27C64A is 64 Kbit 8Kb x 8 UV EPROM and OTP EPROM manufactured by STMicroelectronics.
DESCRIPTION
The M27C64A is a 64Kbit EPROM offered in the two ranges UV (ultra violet erase) and OTP (one time programmable). It is ideally suited for microprocessor systems requiring large programs and is organized as 8,192 by 8 bits. The FDIP28W (window ceramic frit-seal package) has transparent lid which allows the user to expose the chip to ultraviolet light to erase the bit pattern. A new 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 PLCC32 package.
PLCC32 (C)
FDIP28W (F)
Figure 1. Logic Diagram
13 A0-A12
8 Q0-Q7
Table 1. Signal Names
A0-A12 Q0-Q7 E G P VPP VCC VSS March 1998 Address Inputs Data Outputs Chip Enable Output Enable
Program Program Supply Supply Voltage Ground 1/12
AI00834B
Figure 2A. DIP Pin Connections Figure 2B. LCC Pin Connections
AI00835
VSS DU Q3 Q4 Q5
AI00836
VPP A12 A7 A6 A5 A4 A3 A2 A1 A0 Q0 Q1 Q2 VSS
1 28 2 27 3 26 4 25 5 24 6 23 7 22 M27C64A 21 8 20 9 19 10 18 11 17 12 16 13 15 14
VCC P NC A8 A9 A11 G A10 E Q7 Q6 Q5 Q4 Q3
A7 A12 VPP DU VCC P NC
1 32 A6 A5 A4 A3 A2 A1 A0 NC Q0 A8 A9 A11 NC G A10 E Q7 Q6 9 M27C64A 25 17
Warning: NC = Not Connected, DU = Don’t Use
Warning: NC = Not Connected
Table 2. Absolute Maximum Ratings (1)
Symbol TA TBIAS TSTG VIO
(2)
Parameter Ambient Operating Temperature (3) Temperature Under Bias Storage Temperature Input or Output Voltages (except A9) Supply Voltage A9 Voltage Program Supply Voltage
Q1 Q2
Value
- 40 to 125
- 50 to 125
- 65 to 150
- 2 to 7
- 2 to 7
- 2 to 13.5
- 2 to 14
Unit °C °C °C V V V...
