TheTTL - Al Kossow's Bitsavers

SN7489
64·BIT RANDOM·ACCESS READ/WRITE MEMORY
PARAMETER MEASUREMENT INFORMATION
VCC
RL1 = 300 n
From output __ ~~ ____ -,
under test
LOAD CIRCUIT
RL2 = 600 n
3V
MEMORY~5V 15V
ENABLE'
•
1 -1---- ov
: 1
r---:--'I
:~~RESS 1.5 V 1.5 V
~
-.....I:
3V
I'----ov
-, r
!4---+tPHL k-+f-t PLH
VOH
ANY 1.5 V 1.5 V
OUTPUT . .
VOL
Write enable is high.
READ CYCLE
MEMORY ~.-----.-------OV
ENABLE
~
\ '--___________ 3 V
~tsu
r+-----' ,.----3V
ANY I \~15V
_J . 1 .I'-____ OV
I
~th
t+f--tsu ---+I I
II I 1----3V
ADDRESS 1.5 Y /I\. .
DATA
INPUT
WRITE
ENABLE
I 1
I
I
_-----3V
1.5 V
'--___.1.-1_______ - OV
i+--tSR-ti
ANY HIGH ----------+-1 -\ I~ VOH
OUTPUT I ,,-* 1.5 V
I ----- VOL
\4--tSR--+I
ANY LOW ~ ,-', y,:~OH
OUTPUT
~----~":.:"--VOL
WRITE CYCLE FROM WRITE ENABLE
NOTES: A. The input pulse generators have the following characteristics: tr ::; 10 ns, tf ::; 10 ns, PRR = 1 MHz, Zout .. 50 O.
B. CL includes probe and jig capacitance.
FIGURE 1-SWITCHING CHARACTERISTICS
TEXAS •
INSTRUMENTS
POST OFFICE BOX 225012 • DALLAS, TEXAS 75265
5-7