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Part: M27C256B-70-1
Category:
Memory
-> ROM
-> OTP ROM
Description: 256 Kbit (32KB X8) uv EPROM And OTP EPROM
Company: ST Microelectronics, Inc.
Datasheet: Download M27C256B-70-1 datasheet File size : 45 kB
Request For quote: Find where to buy M27C256B-70-1
Datasheet text preview:
M27C256B
256 Kbit (32Kb x 8) UV EPROM and OTP EPROM
s
5V ± 10% SUPPLY VOLTAGE in READ OPERATION ACCESS TIME: 45ns LOW POWER CONSUMPTION: Active Current 30mA at 5MHz Standby Current 100µA
28
s s
28
s s s
PROGRAMMING VOLTAGE: 12.75V ± 0.25V PROGRAMMING TIME: 100µs/word ELECTRONIC SIGNATURE Manufacturer Code: 20h Device Code: 8Dh
1
1
FDIP28W (F)
PDIP28 (B)
DESCRIPTION The M27C256B is a 256 Kbit EPROM offered in the two ranges UV (ultra violet erase) and OTP (one time programmable). It is ideally suited for microprocessor systems and is organized as 32,768 by 8 bits. The FDIP28W (window ceramic frit-seal package) has a 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 one time and erasure is not required, the M27C256B is offered in PDIP28, PLCC32 and TSOP28 (8 x 13.4 mm) packages.
PLCC32 (C)
TSOP28 (N) 8 x 13.4 mm
Figure 1. Logic Diagram
VCC
VPP
15 A0-A14
8 Q0-Q7
E G
M27C256B
VSS
AI00755B
August 2002
1/16
M27C256B
Figure 2A. DIP Connections Figure 2B. LCC Connections
AI00756
VSS DU Q3 Q4 Q5
AI00757
VPP A12 A7 A6 A5 A4 A3 A2 A1 A0 Q0 Q1 Q2 VSS
28 1 27 2 26 3 25 4 24 5 23 6 22 7 M27C256B 21 8 20 9 19 10 18 11 17 12 13 16 14 15
VCC A14 A13 A8 A9 A11 G A10 E Q7 Q6 Q5 Q4 Q3
A7 A 12 VPP DU VCC A 14 A 13 1 32 A6 A5 A4 A3 A2 A1 A0 NC Q0 A8 A9 A11 NC G A10 E Q7 Q6 9 M27C256B 25 17 Q1 Q2
A0-A14 Q0-Q7
Figure 2C. TSOP Connections
Table 1. Signal Names
Address Inputs Data Outputs Chip Enable Output Enable Program Supply Supply Voltage Ground Not Connected Internally Don't Use
G A11 A9 A8 A13 A14 VCC VPP A12 A7 A6 A5 A4 A3
22
21
28 1
M27C256B
15 14
7
8
AI00614B
A10 E Q7 Q6 Q5 Q4 Q3 VSS Q2 Q1 Q0 A0 A1 A2
E G VPP V CC VSS NC DU
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M27 C256B
Table 2. Absolute Maximum Ratings (1)
Symbol TA TBIAS TSTG VIO (2) VCC VA9 (2) VPP Parameter Ambient Operating Temperature (3) Temperature Under Bias Storage Temperature Input or Output Voltage (except A9) Supply Voltage A9 Voltage Program Supply Voltage 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 V
Note: 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 STMicroelectronics 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. 3. Depends on range.
Table 3. Operating Modes
Mode Read Output Disable Program Verify Program Inhibit Standby Electronic Signature
Note: X = VIH or VIL, VID = 12V ± 0.5V.
E VIL VIL VIL Pulse VIH VIH VIH VIL
G VIL VIH VIH VIL VIH X VIL
A9 X X X X X X VID
V PP VCC VCC V PP V PP V PP VCC VCC
Q7-Q0 Data Out Hi-Z Data In Data Out Hi-Z Hi-Z Codes
Table 4. Electronic Signature
Identifier Manufacturer's Code Device Code A0 VIL VIH Q7 0 1 Q6 0 0 Q5 1 0 Q4 0 0 Q3 0 1 Q2 0 1 Q1 0 0 Q0 0 1 Hex Data 20h 8Dh
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Others parts begin by m2
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