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74ACQ245, 74ACTQ245 — Quiet Series™ Octal Bidirectional Transceiver with 3-STATE Inputs/Outputs
January 2008
74ACQ245, 74ACTQ245
Quiet Series™ Octal Bidirectional Transceiver with
3-STATE Inputs/Outputs
Features
■
I
CC
and I
OZ
reduced by 50%
■
Guaranteed simultaneous switching noise level and
■
■
■
■
■
General Description
The ACQ/ACTQ245 contains eight non-inverting bidirec-
tional buffers with 3-STATE outputs and is intended for
bus-oriented applications. Current sinking capability is
24mA at both the A and B ports. The Transmit/Receive
(T/R) input determines the direction of data flow through
the bidirectional transceiver. Transmit (active-HIGH)
enables data from A Ports to B Ports; Receive (active-
LOW) enables data from B Ports to A Ports. The Output
Enable input, when HIGH, disables both A and B ports
by placing them in a HIGH Z condition.
The ACQ/ACTQ utilizes Fairchild Quiet Series™
technology to guarantee quiet output switching and
improve dynamic threshold performance. FACT Quiet
Series™ features GTO™ output control and undershoot
corrector in addition to a split ground bus for superior
performance.
dynamic threshold performance
Guaranteed pin-to-pin skew AC performance
Improved latch-up immunity
3-STATE outputs drive bus lines or buffer memory
address registers
Outputs source/sink 24mA
Faster prop delays than the standard ACT245
Ordering Information
Order Number
74ACQ245SC
74ACQ245SJ
74ACTQ245SC
74ACTQ245SJ
74ACTQ245QSC
74ACTQ245MSA
74ACTQ245MTC
Package
Number
M20B
M20D
M20B
M20D
MQA20
MSA20
MTC20
Package Description
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300"
Wide
20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300"
Wide
20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
20-Lead Quarter Size Outline Package (QSOP), JEDEC MO-137, 0.150"
Wide
20-Lead Shrink Small Outline Package (SSOP), JEDEC MO-150, 5.3mm
Wide
20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153,
4.4mm Wide
Device also available in Tape and Reel. Specify by appending suffix letter “X” to the ordering number.
All packages are lead free per JEDEC: J-STD-020B standard.
©1989 Fairchild Semiconductor Corporation
74ACQ245, 74ACTQ245 Rev. 1.5.1
www.fairchildsemi.com
74ACQ245, 74ACTQ245 — Quiet Series™ Octal Bidirectional Transceiver with 3-STATE Inputs/Outputs
Connection Diagram
Logic Symbol
IEEE/IEC
Pin Description
Pin Names
OE
T/R
A
0
–A
7
B
0
–B
7
Description
Output Enable Input
Transmit/Receive Input
Side A 3-STATE Inputs or 3-STATE
Outputs
Side B 3-STATE Inputs or 3-STATE
Outputs
Truth Table
Inputs
OE
L
L
H
L
H
X
T/R
Outputs
Bus B Data to Bus A
Bus A Data to Bus B
HIGH-Z State
H
=
HIGH Voltage Level
L
=
LOW Voltage Level
X
=
Immaterial
©1989 Fairchild Semiconductor Corporation
74ACQ245, 74ACTQ245 Rev. 1.5.1
www.fairchildsemi.com
2
74ACQ245, 74ACTQ245 — Quiet Series™ Octal Bidirectional Transceiver with 3-STATE Inputs/Outputs
Absolute Maximum Ratings
Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be
operable above the recommended operating conditions and stressing the parts to these levels is not recommended.
In addition, extended exposure to stresses above the recommended operating conditions may affect device reliability.
The absolute maximum ratings are stress ratings only.
Symbol
V
CC
I
IK
Supply Voltage
DC Input Diode Current
V
I
=
–0.5V
V
I
=
V
CC
+ 0.5V
V
I
I
OK
DC Input Voltage
DC Output Diode Current
V
O
=
–0.5V
V
O
=
V
CC
+ 0.5V
V
O
I
O
DC Output Voltage
Parameter
Rating
–0.5V to +7.0V
–20mA
+20mA
–0.5V to V
CC
+ 0.5V
–20mA
+20mA
–0.5V to V
CC
+ 0.5V
±50mA
±50mA
–65°C to +150°C
±300mA
140°C
DC Output Source or Sink Current
I
CC
or I
GND
DC V
CC
or Ground Current per Output Pin
T
STG
Storage Temperature
DC Latch-Up Source or Sink Current
T
J
Junction Temperature
Recommended Operating Conditions
The Recommended Operating Conditions table defines the conditions for actual device operation. Recommended
operating conditions are specified to ensure optimal performance to the datasheet specifications. Fairchild does not
recommend exceeding them or designing to absolute maximum ratings.
Symbol
V
CC
Supply Voltage
ACQ
ACTQ
V
I
V
O
T
A
∆
V /
∆
t
∆V
/
∆
t
Input Voltage
Output Voltage
Operating Temperature
Parameter
Rating
2.0V to 6.0V
4.5V to 5.5V
0V to V
CC
0V to V
CC
–40°C to +85°C
125mV/ns
125mV/ns
Minimum Input Edge Rate, ACQ Devices:
V
IN
from 30% to 70% of V
CC
, V
CC
@ 3.0V, 4.5V, 5.5V
Minimum Input Edge Rate, ACTQ Devices:
V
IN
from 0.8V to 2.0V, V
CC
@ 4.5V, 5.5V
©1989 Fairchild Semiconductor Corporation
74ACQ245, 74ACTQ245 Rev. 1.5.1
www.fairchildsemi.com
3
74ACQ245, 74ACTQ245 — Quiet Series™ Octal Bidirectional Transceiver with 3-STATE Inputs/Outputs
DC Electrical Characteristics for ACQ
Symbol
V
IH
Parameter
Minimum HIGH Level
Input Voltage
V
CC
(V)
3.0
4.5
5.5
3.0
4.5
5.5
3.0
4.5
5.5
3.0
4.5
5.5
Conditions
V
OUT
=
0.1V or
V
CC
– 0.1V
V
OUT
=
0.1V or
V
CC
– 0.1V
I
OUT
=
–50µA
T
A
=
+25°C T
A
=
–40°C to +85°C
Typ.
Guaranteed Limits
Units
1.5
2.25
2.75
1.5
2.25
2.75
2.99
4.49
5.49
2.1
3.15
3.85
0.9
1.35
1.65
2.9
4.4
5.4
2.56
3.86
4.86
0.002
0.001
0.001
0.1
0.1
0.1
0.36
0.36
0.36
±0.1
2.1
3.15
3.85
0.9
1.35
1.65
2.9
4.4
5.4
2.46
3.76
4.76
0.1
0.1
0.1
0.44
0.44
0.44
±1.0
75
–75
4.0
±0.3
40.0
±3.0
µA
mA
mA
µA
µA
V
V
V
V
V
IL
Maximum LOW Level
Input Voltage
V
OH
Minimum HIGH Level
Output Voltage
V
IN
=
V
IL
or V
IH
,
I
OH
=
–12mA
V
IN
=
V
IL
or V
IH
,
I
OH
=
–24mA
V
IN
=
V
IL
or V
IH
,
I
OH
=
–24mA
(1)
I
OUT
=
50µA
V
OL
Maximum LOW Level
Output Voltage
3.0
4.5
5.5
3.0
4.5
5.5
V
IN
=
V
IL
or V
IH
,
I
OL
=
12mA
V
IN
=
V
IL
or V
IH
,
I
OL
=
24mA
V
IN
=
V
IL
or V
IH
,
I
OL
=
24mA
(1)
V
I
=
V
CC
, GND
V
OLD
=
1.65V Max.
V
OHD
=
3.85V Min.
V
IN
=
V
CC
or GND
V
I
(OE)
=
V
IL
, V
IH
;
V
I
=
V
CC
, GND;
V
O
=
V
CC
, GND
Figures 1 & 2
(4)
Figures 1 & 2
(4)
(5)
I
IN(3)
I
OLD
I
OHD
I
CC(3)
I
OZT
Maximum Input
Leakage Current
Minimum Dynamic
Output Current
(2)
Maximum Quiescent
Supply Current
Maximum I/O
Leakage Current
Quiet Output
Maximum Dynamic V
OL
Quiet Output Minimum
Dynamic V
OL
Minimum HIGH Level
Dynamic Input Voltage
Maximum LOW Level
Dynamic Input Voltage
5.5
5.5
5.5
5.5
5.5
V
OLP
V
OLV
V
IHD
V
ILD
5.0
5.0
5.0
5.0
1.1
–0.6
3.1
1.9
1.5
–1.2
3.5
1.5
V
V
V
V
5)
Notes:
1. All outputs loaded; thresholds on input associated with output under test.
2. Maximum test duration 2.0ms, one output loaded at a time.
3. I
IN
and I
CC
@ 3.0V are guaranteed to be less than or equal to the respective limit @ 5.5V V
CC
.
4. Max number of outputs defined as (n). Data Inputs are driven 0V to 5V; one output @ GND.
5. Max number of Data Inputs (n) switching. (n–1) Inputs switching 0V to 5V (ACQ). Input-under-test switching:
5V to threshold (V
ILD
), 0V to threshold (V
IHD
), f
=
1 MHz.
©1989 Fairchild Semiconductor Corporation
74ACQ245, 74ACTQ245 Rev. 1.5.1
www.fairchildsemi.com
4
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