TMS27C240 262144 BY 16BIT UV ERASABLE

TMS27PC240 262144 BY 16BIT

PROGRAMMABLE READONLY MEMORIES

SMLS240D− NOVEMBER 1990 − REVISED SEPTEMBER 1997

11

POST OFFICE BOX 1443

PARAMETER MEASUREMENT INFORMATION

Output

Under Test

CL = 100 pF

(see Note A)

RL = 800 Ω

2.08 V

2.4 V

0.40 V

2 V

0.8 V

2 V

0.8 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

Address Valid

A0 − A17

E

G

DQ0 − DQ15

Output

Valid

Hi-Z

Hi-Z

tv(A)

tdis

ten(G)

ta(A)

ta(E)

Figure 3. Read-Cycle Timing