TMS27C020 262144 BY 8-BIT UV ERASABLE

TMS27PC020 262144 BY 8-BIT

PROGRAMMABLE READ-ONLY MEMORIES

SMLS020C – NOVEMBER 1990 – REVISED SEPTEMBER 1997

10

POST OFFICE BOX 1443

PARAMETER MEASUREMENT INFORMATION

2.08 V

RL = 800 Ω

CL = 100 pF

(see Note A)

Output

Under Test

2 V

0.8 V

2 V

0.8 V

2.4 V

0.4 V

NOTES: A. CL includes probe and fixture capacitance.

B. The ac testing inputs are driven at 2.4 V for logic high and 0.4 V for logic low. Timing

measurements are made at 2 V for logic high and 0.8 V for logic low for both inputs

and outputs.

Figure 2. The ac Testing Output Load Circuit and Waveform

A0 – A17

E

Addresses Valid

ta(A)

ta(E)

G

DQ0 – DQ7

Hi-Z

ten(G)

tv(A)

tdis

Output Valid

VIH

VIL

VIH

VIL

VIH

VIL

VIH

VIL

Hi-Z

Figure 3. Read-Cycle Timing