Datasheet

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Timing Requirements
Switching Characteristics
SN54GTL16612, SN74GTL16612
18-BIT LVTTL-TO-GTL/GTL+ UNIVERSAL BUS TRANSCEIVERS
SCBS480K – JUNE 1994 – REVISED JULY 2005
over recommended ranges of supply voltage and operating free-air temperature,
V
TT
= 1.2 V and V
REF
= 0.8 V for GTL (unless otherwise noted) (see Figure 1 )
SN54GTL16612 SN74GTL16612
UNIT
MIN MAX MIN MAX
f
clock
Clock frequency 95 95 MHz
LEAB or LEBA high 3.3 3.3
t
w
Pulse duration ns
CLKAB or CLKBA high or low 5.6 5.6
A before CLKAB ↑ 1.3 1.3
B before CLKBA ↑ 3.4 2.5
A before LEAB ↓ 1.2 0
t
su
Setup time ns
B before LEBA ↓ 1 1
CEAB before CLKAB ↑ 2.1 2
CEBA before CLKBA ↑ 2.6 2.2
A after CLKAB ↑ 2.9 1.6
B after CLKBA ↑ 4.1 0.3
A after LEAB ↓ 4.5 4
t
h
Hold time ns
B after LEBA ↓ 4.3 3.6
CEAB after CLKAB ↑ 2 0.8
CEBA after CLKBA ↑ 1.1 1.1
over recommended ranges of supply voltage and operating free-air temperature,
V
TT
= 1.2 V and V
REF
= 0.8 V for GTL (see Figure 1 )
SN54GTL16612 SN74GTL16612
FROM TO
PARAMETER UNIT
(INPUT) (OUTPUT)
MIN TYP
(1)
MAX MIN TYP
(1)
MAX
f
max
95 95 MHz
t
PLH
1 2.8 4.5 1.5 2.8 4.1
A B ns
t
PHL
1 2.5 4.5 1.3 2.5 4
t
PLH
1 3.6 5.5 2 3.6 5.3
LEAB B ns
t
PHL
1 3.5 6 1.9 3.5 5.4
t
PLH
1 3.7 5.5 2.3 3.7 5.3
CLKAB B ns
t
PHL
1 3.4 5.5 1.9 3.4 5.4
t
en
1 3.3 5.5 2 3.3 5.5
OEAB B ns
t
dis
1 3.4 5.5 2 3.4 5.1
t
r
Transition time, B outputs (0.5 V to 1 V) 1.3 1.3 ns
t
f
Transition time, B outputs (1 V to 0.5 V) 0.5 0.5 ns
t
PLH
2 4.1 6.9 2.1 4.1 6.3
B A ns
t
PHL
1 2.9 5.1 1.2 2.9 4.6
t
PLH
2 3.7 6.1 2.3 3.7 5.7
LEBA A ns
t
PHL
1 3 5.1 1.8 3 4.8
t
PLH
2 3.8 6.4 2.5 3.8 6.1
CLKBA A ns
t
PHL
2 3.3 5.6 2.3 3.3 5.2
t
en
1 5 7.5 2.3 5 7.4
OEBA A ns
t
dis
2 4.3 6.9 2.5 4.3 6.4
(1) All typical values are at V
CC
(3.3 V) = 3.3 V, V
CC
(5 V) = 5 V, T
A
= 25°C.
6