Datasheet

SN74VMEH22501
LVTTL-TO-ETL 8-BIT UNIVERSAL BUS TRANSCEIVER AND TWO 1-BIT BUS
TRANSCEIVERS WITH SPLIT LVTTL PORT, FEEDBACK PATH, AND 3-STATE OUTPUTS
SCES357A – JULY 2001 – REVISED SEPTEMBER 2001
6–18
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
driver in slot 1, with one receiver in slot 21 (minimum load)
switching characteristics over recommended operating conditions for the bus transceiver
function (unless otherwise noted) (see Figure 3)
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
MIN TYP
†
MAX UNIT
t
PLH
5.5 7.4
t
PHL
1A or 2A
1B or 2B
5.3 7.4
ns
t
r
‡
Transition time, B port (10%–90%)
3.9 3.4 4.4 ns
t
f
‡
Transition time, B port (90%–10%)
3.7 3.4 4.8 ns
†
All typical values are at V
CC
= 3.3 V, T
A
= 25°C. All values are derived from TI-SPICE models.
‡
All t
r
and t
f
times are taken at the first receiver.
switching characteristics over recommended operating conditions for UBT (unless otherwise
noted) (see Figure 3)
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
MIN TYP
†
MAX UNIT
t
PLH
5.8 7.9
t
PHL
3A
3B
5.5 7.7
ns
t
PLH
5.9 8
t
PHL
LE
3B
5.5 7.8
ns
t
PLH
5.9 8.1
t
PHL
CLKAB
3B
5.5 7.7
ns
t
r
‡
Transition time, B port (10%–90%)
3.9 3.4 4.4 ns
t
f
‡
Transition time, B port (90%–10%)
3.7 3.4 4.8 ns
†
All typical values are at V
CC
= 3.3 V, T
A
= 25°C. All values are derived from TI-SPICE models.
‡
All t
r
and t
f
times are taken at the first receiver.
skew characteristics for bus transceiver for specific worst-case V
CC
and temperature within the
recommended ranges of supply voltage and operating free-air temperature (see Figure 3)
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
MIN TYP
†
MAX UNIT
t
sk(LH)
1.7
t
sk(HL)
1A or 2A 1B or 2B
2.1
ns
t
sk(t)
§
1A or 2A 1B or 2B 0.2 2.1 ns
t
sk(pp)
1A or 2A 1B or 2B ns
†
All typical values are at V
CC
= 3.3 V, T
A
= 25°C. All values are derived from TI-SPICE models.
§
t
sk(t)
– Output-to-output skew is defined as the absolute value of the difference between the actual propagation delay for all outputs of the same
packaged device. The specifications are given for specific worst-case V
CC
and temperature and apply to any outputs switching in opposite
directions, both low to high (LH) and high to low (HL) [t
sk(t)
].
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