SN54BCT646 Datasheet, PDF (7/15 Pages) Texas Instruments – OCTAL BUS TRANSCEIVERS AND REGISTERS WITH 3-STATE OUTPUTS

SN54BCT646, SN74BCT646
OCTAL BUS TRANSCEIVERS AND REGISTERS
WITH 3ĆSTATE OUTPUTS
SCBS037D − AUGUST 1989 − REVISED MAY 2004
switching characteristics over recommended ranges of supply voltage and operating free-air
temperature, C_L = 50 pF (unless otherwise noted) (see Figure 2)
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
VCC = 5 V,
TA = 25°C
MIN TYP MAX
SN54BCT646
MIN MAX
SN74BCT646
MIN MAX
UNIT
fmax
83
83
83
MHz
tPLH
tPHL
CLKBA or CLKAB
A or B
3.6
7 9.4 3.6 12.4 3.6 11.2
ns
3.9
7 9.2 3.9 11.5 3.9 10.6
tPLH
tPHL
A or B
B or A
3.1
6 8.1 3.1 11.1 3.1 9.5
ns
3.7 6.8 8.9 3.7 12.1 3.7 10.5
tPLH
tPHL
SAB or SBA†
(with A or B high)
A or B
4.5 8.8 11.2 4.5 15.2 4.5 13.8
ns
3.3
6 8.1 3.3 9.8 3.3 9.1
tPLH
tPHL
SAB or SBA†
(with A or B low)
A or B
3.9 7.7 10.2 3.9 13.3 3.9
12
ns
4.7 8.3 10.8 4.7 13.7 4.7 12.9
tPZH
tPZL
4 7.9 10.7
4
14
4 13.2
OE
A or B
ns
4.6 8.8 11.8 4.6 15.4 4.6 14.4
tPHZ
tPLZ
4 7.2 9.4
4
12
4 10.9
OE
A or B
ns
3.4
7 9.3 3.4 11.6 3.4 10.5
tPZH
2.8 7.8 10.7 2.8
14 2.8 13.1
DIR
A or B
ns
tPZL
3.8 8.9 11.9 3.8 15.6 3.8 14.6
tPHZ
DIR
A or B
3.8 8.4 10.7 3.8 13.2 3.8 12.6
ns
tPLZ
3.2 7.3 9.9 3.2 12.6 3.2 11.8
† _{These parameters are measured with the internal output state of the storage register opposite that of the bus input.}
• POST OFFICE BOX 655303 DALLAS, TEXAS 75265
7