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TMS27PC210A Datasheet(PDF) 4 Page - Texas Instruments

Part # TMS27PC210A
Description  PROGRAMMABLE READ-ONLY MEMORIES
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
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TMS27PC210A Datasheet(HTML) 4 Page - Texas Instruments

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TMS27C210A 65536 BY 16-BIT UV ERASABLE
TMS27PC210A 65536 BY 16-BIT
PROGRAMMABLE READ-ONLY MEMORIES
SMLS310D– NOVEMBER 1990 – REVISED SEPTEMBER 1997
4
POST OFFICE BOX 1443
HOUSTON, TEXAS 77251–1443
SNAP! Pulse programming
The TMS27C210A and TMS27PC210A are programmed using the TI SNAP! Pulse programming algorithm
(shown in the flow chart in Figure 1), which can program in a nominal time of seven seconds. Actual
programming time varies as a function of the programmer used.
The SNAP! Pulse programming algorithm uses an initial pulse 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, E = VIL, G = VIH. Data is presented in parallel
(16 bits) on pins DQ0 through DQ15. Once addresses and data are stable, PGM is pulsed low.
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 ± 10%.
program inhibit
Programming can be inhibited by maintaining a high level input on the E or PGM pins.
program verify
Programmed bits can be verified with VPP = 13 V when G = VIL, E = VIL, and PGM = 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. DQ0 – DQ7 contain the
valid codes. All other addresses must be held low. The signature code for these devices is 97AB. A0 low selects
the manufacturer’s code 97 ( Hex), and A0 high selects the device code AB (Hex), 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
1
0
1
0
1
0
1
1
AB
† E = G = VIL, A9 = VH, A1–A8 = VIL, A10–A15 = VIL, VPP = VCC, PGM = VIH or VIL.


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