SN74BCT979 Datasheet, PDF (6/10 Pages) Texas Instruments – 9-BIT REGISTERED BTL TRANSCEIVER WITH PARITY GENERATOR/CHECKER

SN74BCT979
9ĆBIT REGISTERED BTL TRANSCEIVER
WITH PARITY GENERATOR/CHECKER
SCBS115A − OCTOBER 1990 − REVISED NOVEMBER 1993
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
MIN TYP† MAX UNIT
VIK
IOH
VOH
LE, OE, SEL, ODD/EVEN, AI1 −AI8, APARI
B1 −B8, BPAR
VCC = 4.5 V,
VCC = 5.5 V,
AO1 −AO8, APARO, ERRA, ERRB
VCC = 4.5 V
VOL
AO1 −AO8, APARO, ERRA, ERRB
VCC = 4.5 V
II
IIH
IIL
IOZH
IOZL
IOS§
LE, OE, SEL, ODD/EVEN, AI1 −AI8, APARI
LE, OE, SEL, ODD/EVEN, AI1 −AI8, APARI
B1 −B8, BPAR‡
LE, OE, SEL, ODD/EVEN, AI1 − AI8, APARI
B1 −B8, BPAR‡
AO1 −AO8, APARO
AO1 −AO8, APARO
AO1 −AO8, APARO
Outputs high
VCC = 5.5 V,
VCC = 5.5 V
VCC = 5.5 V
VCC = 5.5 V,
VCC = 5.5 V,
VCC = 5.5 V,
II = −18 mA
VOH = 2.1 mA
IOH = −1 mA
IOH = − 3 mA
IOL = 24 mA
IOL = 80 mA
IOL = 100 mA
VI = 5.5 V
VI = 2.7 V
VI = 2.1 V
VI = 0.5 V
VI = 0.3 V
VO = 2.7 V
VO = 0.5 V
VO = 0
−1.2 V
100 µA
2.5 3.4
V
2.4 3.3
0.35 0.5
0.75
1.1 V
0.75
1.15
100 µA
20
µA
100
− 20
µA
−100
50 µA
−50 µA
− 60
−200 mA
17
36
ICC
Outputs low
Outputs disabled
VCC = 5.5 V,
Outputs open
69
85 mA
21
42
LE, OE, SEL, ODD/EVEN
Ci
AI1 −AI8, APARI
VCC = 5 V,
VI = 2.5 V or 0.5 V
8
pF
8
Cio
B1 −B8, BPAR
VCC = 5 V,
VO = 2.5 V or 0.5 V
5
pF
Co
AO1 −AO8, APARO
VCC = 5 V,
VO = 2.5 V or 0.5 V
6.5
pF
TT
Output transition time
B port¶
1
ns
† _{All typical values are at VCC = 5 V, TA = 25°C.}
‡ _{For I/O ports, the parameters IIH and IIL include the off-state output current.}
§ _{Not more than one output should be tested at a time, and the duration of the test should not exceed one second.}
¶ _{Measured from 1.3 V to 1.8 V (see Figure 1).}
timing requirements over recommended ranges of supply voltage and operating free-air
temperature (unless otherwise noted)
tw
Pulse duration
tsu
Setup time
th
Hold time
AI1 −AI8, APARI before LEAB↓
B1 −B8, BPAR before LEBA↓
AI1 −AI8, APARI after LEAB↓
B1 −B8, BPAR after LEBA↓
LEAB high
LEBA high
Data high
Data low
Data high
Data low
Data high
Data low
Data high
Data low
VCC = 5 V,
TA = 25°C
MIN MAX
5
4
4
3
8.5
7
1
2.5
0.5
0.5
MIN MAX UNIT
5
ns
4
4
3
ns
8.5
7
1
2.5
ns
0.5
0.5
6
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