Datasheet
CY54FCT646T, CY74FCT646T
8-BIT REGISTERED TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCCS031A – JULY 1994 – REVISED OCTOBER 2001
8
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
timing requirements over recommended operating free-air temperature range (unless otherwise
noted) (see Figure 2)
CY54FCT646T CY54FCT646AT CY54FCT646CT
UNIT
MIN MAX MIN MAX MIN MAX
UNIT
t
w
Pulse duration 6 5 5 ns
t
su
Setup time, data before CPAB↑ or CPBA↑ 4.5 2 2 ns
t
h
Hold time, data after CPAB↑ or CPBA↑ 2 1.5 1.5 ns
timing requirements over recommended operating free-air temperature range (unless otherwise
noted) (see Figure 2)
CY74FCT646T CY74FCT646AT CY74FCT646CT
UNIT
MIN MAX MIN MAX MIN MAX
UNIT
t
w
Pulse duration 6 5 5 ns
t
su
Setup time, data before CPAB↑ or CPBA↑ 4 2 2 ns
t
h
Hold time, data after CPAB↑ or CPBA↑ 2 1.5 1.5 ns
switching characteristics over operating free-air temperature range (see Figure 2)
PARAMETER
FROM TO
CY54FCT646T CY54FCT646AT CY54FCT646CT
UNIT
PARAMETER
(INPUT) (OUTPUT)
MIN MAX MIN MAX MIN MAX
UNIT
t
PLH
AorB
BorA
2 11 2 7.7 1.5 6
ns
t
PHL
A
or
B
B
or
A
2 11 2 7.7 1.5 6
ns
t
PZH
DIR
AorB
2 15 2 10.5 1.5 8.9
ns
t
PZL
DIR
A
or
B
2 15 2 10.5 1.5 8.9
ns
t
PHZ
G and DIR
AorB
2 11 2 7.7 1.5 7.7
ns
t
PLZ
G
an
d
DIR
A
or
B
2 11 2 7.7 1.5 7.7
ns
t
PLH
CPAB or CPBA
AorB
2 10 2 7 1.5 6.3
ns
t
PHL
CPAB
or
CPBA
A
or
B
2 10 2 7 1.5 6.3
ns
t
PLH
SBA or SAB
AorB
2 12 2 8.4 1.5 7
ns
t
PHL
SBA
or
SAB
A
or
B
2 12 2 8.4 1.5 7
ns
switching characteristics over operating free-air temperature range (see Figure 2)
PARAMETER
FROM TO
CY74FCT646T CY74FCT646AT CY74FCT646CT
UNIT
PARAMETER
(INPUT) (OUTPUT)
MIN MAX MIN MAX MIN MAX
UNIT
t
PLH
AorB
BorA
1.5 9 1.5 6.3 1.5 5.4
ns
t
PHL
A
or
B
B
or
A
1.5 9 1.5 6.3 1.5 5.4
ns
t
PZH
DIR
AorB
1.5 14 1.5 9.8 1.5 7.8
ns
t
PZL
DIR
A
or
B
1.5 14 1.5 9.8 1.5 7.8
ns
t
PHZ
G and DIR
AorB
1.5 9 1.5 6.3 1.5 6.3
ns
t
PLZ
G
an
d
DIR
A
or
B
1.5 9 1.5 6.3 1.5 6.3
ns
t
PLH
CPAB or CPBA
AorB
1.5 9 1.5 6.3 1.5 5.7
ns
t
PHL
CPAB
or
CPBA
A
or
B
1.5 9 1.5 6.3 1.5 5.7
ns
t
PLH
SBA or SAB
AorB
1.5 11 1.5 7.7 1.5 6.2
ns
t
PHL
SBA
or
SAB
A
or
B
1.5 11 1.5 7.7 1.5 6.2
ns