TMS27C020 262144 BY 8-BIT UV ERASABLE

TMS27PC020 262144 BY 8-BIT

PROGRAMMABLE READ-ONLY MEMORIES

SMLS020C – NOVEMBER 1990 – REVISED SEPTEMBER 1997

11

POST OFFICE BOX 1443

PARAMETER MEASUREMENT INFORMATION

ten(G)†

A0 – A17

DQ0 – DQ7

VPP

VCC

Address Stable

VIH

VIL

VPP‡

VCC

VCC‡

VCC

Program

Verify

tsu(A)

th(A)

tsu(D)

tsu(VPP)

tsu(VCC)

tsu(E)

th(D)

tsu(G)

tw(PGM)

tdis(G)†

Data-In Stable

Data-Out

Valid

Address

N + 1

E

PGM

G

VIH

VIL

VIH

VIL

VIH

VIL

† tdis(G) and ten(G) are characteristics of the device but must be accommodated by the programmer.

‡ 13-V VPP and 6.5-V VCC for SNAP! Pulse programming.

Figure 4. Program-Cycle Timing (SNAP! Pulse Programming)