Datasheet
SN54ABT16646, SN74ABT16646
16-BIT BUS TRANSCEIVERS AND REGISTERS
WITH 3-STATE OUTPUTS
SCBS212D – JUNE 1992 – REVISED JULY 1999
9
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
switching characteristics over recommended ranges of supply voltage and operating free-air
temperature, C
L
= 50 pF (unless otherwise noted) (see Figure 2)
SN54ABT16646
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
V
CC
= 5 V,
T
A
= 25°C
MIN MAX
UNIT
MIN TYP MAX
f
max
125 125 MHz
t
PLH
CLKBA or CLKAB
AorB
1.5 3.1 4 1 5
ns
t
PHL
CLKBA
or
CLKAB
A
or
B
1.5 3.2 4.1 1 5
ns
t
PLH
AorB
BorA
1 2.3 3.2 0.6 4
ns
t
PHL
A
or
B
B
or
A
1 3 4.1 0.6 4.9
ns
t
PLH
SAB or SBA
†
BorA
1 2.9 4.3 0.6 5.3
ns
t
PHL
SAB
or
SBA
†
B
or
A
1 3.1 4.3 0.6 5.3
ns
t
PZH
OE
AorB
1 3.4 4.6 0.6 5.9
ns
t
PZL
OE
A
or
B
1.5 3.5 5.3 1 6
ns
t
PHZ
OE
AorB
1.5 3.9 5.6 1 6.4
ns
t
PLZ
OE
A
or
B
1.5 3.1 4.4 1 4.7
ns
t
PZH
DIR
AorB
1 3.2 4.5 0.6 5.8
ns
t
PZL
DIR
A
or
B
1.5 3.4 5.1 1 6.7
ns
t
PHZ
DIR
AorB
2 4.2 5.9 1.2 7.1
ns
t
PLZ
DIR
A
or
B
1.5 3.6 5.1 1 6.2
ns
†
These parameters are measured with the internal output state of the storage register opposite that of the bus input.
switching characteristics over recommended ranges of supply voltage and operating free-air
temperature, C
L
= 50 pF (unless otherwise noted) (see Figure 2)
SN74ABT16646
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
V
CC
= 5 V,
T
A
= 25°C
MIN MAX
UNIT
MIN TYP MAX
f
max
125 125 MHz
t
PLH
CLKBA or CLKAB
AorB
1.5 3.1 4 1.5 4.9
ns
t
PHL
CLKBA
or
CLKAB
A
or
B
1.5 3.2 4.1 1.5 4.7
ns
t
PLH
AorB
BorA
1 2.3 3.2 1 3.9
ns
t
PHL
A
or
B
B
or
A
1 3 4.1 1 4.6
ns
t
PLH
SAB or SBA
†
BorA
1 2.9 4.3 1 5
ns
t
PHL
SAB
or
SBA
†
B
or
A
1 3.1 4.3 1 5
ns
t
PZH
OE
AorB
1 3.4 4.6 1 5.5
ns
t
PZL
OE
A
or
B
1.5 3.5 4.9 1.5 5.7
ns
t
PHZ
OE
AorB
1.5 3.9 4.9 1.5 5.4
ns
t
PLZ
OE
A
or
B
1.5 3.1 4.1 1.5 4.5
ns
t
PZH
DIR
AorB
1 3.2 4.5 1 5.4
ns
t
PZL
DIR
A
or
B
1.5 3.4 4.8 1.5 5.6
ns
t
PHZ
DIR
AorB
2 4.2 5.7 2 6.7
ns
t
PLZ
DIR
A
or
B
1.5 3.6 5.1 1.5 5.9
ns
†
These parameters are measured with the internal output state of the storage register opposite that of the bus input.