Datasheet

SN74GTLP22034
8-BIT LVTTL-TO-GTLP ADJUSTABLE-EDGE-RATE REGISTERED TRANSCEIVER
WITH SPLIT LVTTL PORT AND FEEDBACK PATH
SCES355C – JUNE 2001 – REVISED SEPTEMBER 2001
3–208
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
switching characteristics over recommended ranges of supply voltage and operating free-air
temperature, V
TT
= 1.5 V and V
REF
= 1 V for GTLP (see Figure 1) (continued)
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
EDGE RATE
†
MIN TYP
‡
MAX UNIT
t
PLH
2.5 6.1
t
PHL
LOOPBACK AO –
2 5.1
ns
t
PLH
AI
1 5.7
t
PHL
(loopback high)
AO –
1 5.4
ns
Slow 2.8
t
r
Rise time, B-port outputs (20% to 80%)
Fast 1.5
ns
Rise time, AO (10% to 90%) 5.5
Slow 3
t
f
Fall time, B-port outputs (80% to 20%)
Fast 1.8
ns
Fall time, AO (90% to 10%) 4.5
†
Slow (ERC = H) and Fast (ERC = L)
‡
All typical values are at V
CC
= 3.3 V, T
A
= 25°C.
skew characteristics over recommended ranges of supply voltage and operating free-air
temperature (see Figure 1)
§
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
EDGE RATE
†
MIN TYP
‡
MAX UNIT
t
sk(LH)
¶
0.5 1
t
sk(HL)
¶
AI B Slow
0.5 1
ns
t
sk(LH)
¶
0.4 0.9
t
sk(HL)
¶
AI B Fast
0.4 0.9
ns
t
sk(LH)
¶
0.5 1
t
sk(HL)
¶
CLKAB/LEAB B Slow
0.5 1
ns
t
sk(LH)
¶
0.4 0.9
t
sk(HL)
¶
CLKAB/LEAB B Fast
0.4 0.9
ns
Slow 1.4 2
AI B
Fast 0.6 1.4
t
sk(t)
¶
Slow 1.8 2.5
ns
CLKAB/LEAB B
Fast 0.9 1.8
†
Slow (ERC = L) and Fast (ERC = H)
‡
All typical values are at V
CC
= 3.3 V, T
A
= 25°C.
§
Actual skew values between the GTLP outputs could vary on the backplane due to the loading and impedance seen by the device.
¶
t
sk(LH)
/t
sk(HL)
and t
sk(t)
– Output-to-output skew is defined as the absolute value of the difference between the actual propagation delay for all
outputs with the same packaged device. The specifications are given for specific worst-case V
CC
and temperature and apply to any outputs
switching in the same direction either high to low [t
sk(HL)
] or low to high [t
sk(LH)
] or in opposite directions, both low to high and high to low [t
sk(t)
].