Datasheet

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SLLS102B − DECEMBER 1990 − REVISED MARCH 1996
7
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
POST OFFICE BOX 1443
• HOUSTON, TEXAS 77251−1443
write cycle timing requirements over recommended ranges of operating free-air temperature and
supply voltage (see Figure 5)
MIN MAX UNIT
t
w5
Pulse duration, IOW low 80 ns
t
su4
Setup time, chip select valid before IOW low (see Note 3) 15 ns
t
su5
Setup time, A2−A0 valid before IOW low (see Note 3) 15 ns
t
su6
Setup time, D0−D7 valid before IOW high 15 ns
t
h3
Hold time, A2−A0 valid after IOW high (see Note 3) 20 ns
t
h4
Hold time, chip select valid after IOW high (see Note 3) 20 ns
t
h5
Hold time, D0−D7 valid after IOW high 15 ns
t
d3
Delay time, t
su5
+ t
w5
+ t
d4
175 ns
t
d4
Delay time, IOW high to IOW or IOR low 80 ns
NOTE 3: The internal address strobe is always active.
read cycle switching characteristics over recommended ranges of operating free-air temperature
and supply voltage (see Figure 4)
PARAMETER TEST CONDITIONS MIN MAX UNIT
t
pd1
Propagation delay time from IOR high to BDO high or from IOR low to
BDO low
C
L
= 100 pF, See Note 5 60 ns
t
en
Enable time from IOR low to D0−D7 valid C
L
= 100 pF, See Note 5 60 ns
t
dis
Disable time from IOR high to D0−D7 released C
L
= 100 pF, See Note 5 0 60 ns
NOTE 5: V
OL
and V
OH
(and the external loading) determine the charge and discharge time.
transmitter switching characteristics over recommended ranges of operating free-air temperature
and supply voltage (see Figures 6, 7, and 8)
PARAMETER TEST CONDITIONS MIN MAX UNIT
t
d5
Delay time, interrupt THRE low to SOUT low at start 8 24
RCLK
cycles
t
d6
Delay time, SOUT low at start to interrupt THRE high See Note 6 8 8
RCLK
cycles
t
d7
Delay time, IOW (WR THR) high to interrupt THRE high See Note 6 16 32
RCLK
cycles
t
d8
Delay time, SOUT low at start to TXRDY low C
L
= 100 pF 8
RCLK
cycles
t
pd2
Propagation delay time from IOW (WR THR) low to interrupt THRE low C
L
= 100 pF 140 ns
t
pd3
Propagation delay time from IOR (RD IIR) high to interrupt THRE low C
L
= 100 pF 140 ns
t
pd4
Propagation delay time from IOW (WR THR) high to TXRDY high C
L
= 100 pF 195 ns
NOTE 6: When the transmitter interrupt delay is active, this delay si lengthened by one character time minus the last stop bit time.