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TMS27C256-2JE Datasheet(PDF) 4 Page - Texas Instruments

Part # TMS27C256-2JE
Description  TMS27C256 32768 BY 8-BIT UV ERASABLE TMS27PC256 32768 BY 8-BIT PROGRAMMABLE READ-ONLY MEMORIES
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

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TMS27C256 32768 BY 8-BIT UV ERASABLE
TMS27PC256 32768 BY 8-BIT
PROGRAMMABLE READ-ONLY MEMORIES
SMLS256H– SEPTEMBER 1984 – REVISED NOVEMBER 1997
4
POST OFFICE BOX 1443
HOUSTON, TEXAS 77251–1443
initializing ( TMS27PC256 )
The one-time programmable TMS27PC256 PROM is provided with all bits in the logic high state, then logic lows
are programmed into the desired locations. Logic lows programmed into an OTP PROM cannot be erased.
SNAP! Pulse programming
The 256K EPROM and OTP PROM are programmed using the TI SNAP! Pulse programming algorithm
illustrated by the flowchart in Figure 1, which programs in a nominal time of four seconds. Actual programming
time varies as a function of the programmer used.
Data is presented in parallel (eight bits) on pins DQ0 to DQ7. Once addresses and data are stable, E is pulsed.
The SNAP! Pulse programming algorithm uses initial pulses of 100 microseconds (
µs) followed by a byte
verification to determine when the addressed byte has been successfully programmed. Up to 10 (ten) 100-
µs
pulses per byte are provided before a failure is recognized.
The programming mode is achieved when VPP = 13 V, VCC = 6.5 V, G = VIH, and E = VIL. More than one device
can be programmed when the devices are connected in parallel. Locations can be programmed in any order.
When the SNAP! Pulse programming routine is complete, all bits are verified with VCC = VPP = 5 V.
program inhibit
Programming can be inhibited by maintaining a high level input on the E pin.
program verify
Programmed bits can be verified with VPP = 13 V when G = VIL and E = VIH.
signature mode
The signature mode provides access to a binary code identifying the manufacturer and type. This mode is
activated when A9 is forced to 12 V. Two identifier bytes are accessed by toggling A0. All other addresses must
be held low. The signature code for these devices is 9704. A0 selects the manufacturer’s code 97 (Hex), and
A0 high selects the device code 04, as shown in Table 3.
Table 3. Signature Mode
IDENTIFIER†
PINS
IDENTIFIER†
A0
DQ7
DQ6
DQ5
DQ4
DQ3
DQ2
DQ1
DQ0
HEX
MANUFACTURER CODE
VIL
1
0
0
1
0
1
1
1
97
DEVICE CODE
VIH
0
0
0
0
0
1
0
0
04
† E = G = VIL, A9 = VH, A1–A8 = VIL, A10–A15 = VIL, VPP = VCC, PGM = VIH or VIL.


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