74VCXH245
Product Preview
Low−Voltage 1.8/2.5/3.3V
8−Bit Transceiver
(3-State, Non-Inverting with Bushold)
The 74VCXH245 is an advanced performance, non-inverting 8-bit
transceiver. It is designed for very high-speed, very low-power
operation in 1.8 V, 2.5 V or 3.3 V systems.
The VCXH245 is designed as a byte control. The Transmit/Receive
(T/Rn) inputs determine the direction of data flow through the
bi-directional transceiver. Transmit (active-HIGH) enables data from
A ports to B ports; Receive (active-LOW) enables data from B to A
ports. The Output Enable input (OE), when HIGH, disables both A
and B ports by placing them in a HIGH Z condition. The data inputs
include active bushold circuitry, eliminating the need for external
pull-up resistors to hold unused or floating inputs at a valid logic state.
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MARKING
DIAGRAMS
20
20
1
VCXH245
AWLYYWW
1
SO-20
DW SUFFIX
CASE 751D
•
Designed for Low Voltage Operation: V
CC
= 1.65-3.6 V
•
High Speed Operation: 3.5 ns max for 3.0 to 3.6 V
•
•
•
•
•
4.2 ns max for 2.3 to 2.7 V
8.4 ns max for 1.65 to 1.95 V
Static Drive:
±24
mA Drive at 3.0 V
±18
mA Drive at 2.3 V
±6
mA Drive at 1.65 V
Includes Active Bushold to Hold Unused or Floating Data Inputs at a
Valid Logic State
Near Zero Static Supply Current in All Three Logic States (20
mA)
Substantially Reduces System Power Requirements
Latchup Performance Exceeds
±250
mA @ 85°C
ESD Performance: Human Body Model >2000 V; Machine Model >200 V
20
20
1
TSSOP-20
DT SUFFIX
CASE 948E
VCXH
245
ALYW
1
20
1
20
1
74VCXH245
AWLYYWW
DQFN
SUFFIX TBD
CASE TBD
A
L , WL
Y, YY
W, WW
= Assembly Location
= Wafer Lot
= Year
= Work Week
This document contains information on a product under development. ON Semiconductor
reserves the right to change or discontinue this product without notice.
©
Semiconductor Components Industries, LLC, 200
1
February, 2003 - Rev. 3
Publication Order Number:
74VCXH245/D
74VCXH245
V
CC
20
OE
19
B0
18
B1
17
B2
16
B3
15
B4
14
B5
13
B6
12
B7
11
TSSOP/SOIC
OE 19
1
T/R
2
A0
3
A1
4
A2
5
A3
6
A4
7
A5
8
A6
9
A7
10
GND
A0
19
12
A1
20
PIN #1
DQFN
11
10
A2
2
9
A3
5
15
A4
6
14
A5
7
13
A6
8
12
B5
4
16
3
17
T/R 1
2
18
B0
B1
B2
Figure 1. Pinout
(Top View)
B3
PIN NAMES
PINS
OE
T/R
A0-A7
B0-B7
FUNCTION
Output Enable Input
Transmit/Receive Input
Side A Bushold Inputs or 3-State Outputs
Side B Bushold Inputs or 3-State Outputs
B4
B6
TRUTH TABLE
INPUTS
OE
L
L
H
T/R
L
H
X
OPERATING MODE
Non-Inverting
B Data to A Bus
A Data to B Bus
Z State
A7
9
11
B7
Figure 2. Logic Diagram
H = High Voltage Level
L = Low Voltage Level
Z = High Impedance State
X = High or Low Voltage Level and Transitions are Acceptable
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2
74VCXH245
ABSOLUTE MAXIMUM RATINGS*
Symbol
V
CC
V
I
V
O
I
IK
I
OK
Parameter
DC Supply Voltage
DC Input Voltage
DC Output Voltage
DC Input Diode Current
DC Output Diode Current
Value
-0.5 to + 4.6
-0.5
≤
V
I
≤
V
CC
+ 0.5
-0.5
≤
V
O
≤
V
CC
+ 0.5
-50
-50
+50
I
O
I
CC
I
GND
T
STG
DC Output Source/Sink Current
DC Supply Current Per Supply Pin
DC Ground Current Per Ground Pin
Storage Temperature Range
±50
±100
±100
-65 to +150
Note 1
V
I
< GND
V
O
< GND
V
O
> V
CC
Condition
Unit
V
V
V
mA
mA
mA
mA
mA
mA
°C
* Absolute maximum continuous ratings are those values beyond which damage to the device may occur. Exposure to these conditions or
conditions beyond those indicated may adversely affect device reliability. Functional operation under absolute-maximum-rated conditions
is not implied.
1. I
O
absolute maximum rating must be observed.
RECOMMENDED OPERATING CONDITIONS**
Symbol
V
CC
V
I
V
O
I
OH
I
OL
I
OH
I
OL
I
OH
I
OL
T
A
Dt/DV
Supply Voltage
Input Voltage
Output Voltage
HIGH Level Output Current, V
CC
= 3.0 V - 3.6 V
LOW Level Output Current, V
CC
= 3.0 V - 3.6 V
HIGH Level Output Current, V
CC
= 2.3 V - 2.7 V
LOW Level Output Current, V
CC
= 2.3 V - 2.7 V
HIGH Level Output Current, V
CC
= 1.65 V - 1.95 V
LOW Level Output Current, V
CC
= 1.65 V - 1.95 V
Operating Free-Air Temperature
Input Transition Rise or Fall Rate, V
IN
from 0.8 V to 2.0 V, V
CC
= 3.0 V
-40
0
Parameter
Operating
Data Retention Only
Min
1.65
1.2
-0.3
0
Typ
3.3
3.3
Max
3.6
3.6
V
CC
V
CC
-24
24
-18
18
-6
6
+85
10
Unit
V
V
V
mA
mA
mA
mA
mA
mA
°C
ns/V
**Floating or unused control inputs must be held HIGH or LOW.
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3
74VCXH245
DC ELECTRICAL CHARACTERISTICS
T
A
= -40°C to +85°C
Symbol
V
IH
Characteristic
HIGH Level Input Voltage (Note 2)
Condition
1.65 V
≤
V
CC
< 1.95 V
2.3 V
≤
V
CC
≤
2.7 V
2.7 V < V
CC
≤
3.6 V
V
IL
LOW Level Input Voltage (Note 2)
1.65 V
≤
V
CC
< 1.95 V
2.3 V
≤
V
CC
≤
2.7 V
2.7 V < V
CC
≤
3.6 V
V
OH
HIGH Level Output Voltage
1.65 V
≤
V
CC
≤
3.6 V; I
OH
= -100
mA
V
CC
= 1.65 V; I
OH
= -6 mA
V
CC
= 2.3 V; I
OH
= -6 mA
V
CC
= 2.3 V; I
OH
= -12 mA
V
CC
= 2.3 V; I
OH
= -18 mA
V
CC
= 2.7 V; I
OH
= -12 mA
V
CC
= 3.0 V; I
OH
= -18 mA
V
CC
= 3.0 V; I
OH
= -24 mA
V
OL
LOW Level Output Voltage
1.65 V
≤
V
CC
≤
3.6 V; I
OL
= 100
mA
V
CC
= 1.65 V; I
OL
= 6 mA
V
CC
= 2.3 V; I
OL
= 12 mA
V
CC
= 2.3 V; I
OL
= 18 mA
V
CC
= 2.7 V; I
OL
= 12 mA
V
CC
= 3.0 V; I
OL
= 18 mA
V
CC
= 3.0 V; I
OL
= 24 mA
I
I
I
I(HOLD)
(
)
Input Leakage Current
Minimum Bushold Input Current
V
IN
= V
CC
or GND; V
CC
= 3.6 V
V
CC
= 3.0 V, V
IN
= 0.8 V
V
CC
= 3.0 V, V
IN
= 2.0 V
V
CC
= 2.3 V, V
IN
= 0.7 V
V
CC
= 2.3 V, V
IN
= 1.6 V
V
CC
= 1.65 V, V
IN
= 0.57 V
V
CC
= 1.65 V, V
IN
= 1.07 V
I
I(OD)
( )
Minimum Bushold Over-Drive
Current Needed to Change State
V
CC
= 3.6 V, (Note 3)
V
CC
= 3.6 V, (Note 4)
V
CC
= 2.7 V, (Note 3)
V
CC
= 2.7 V, (Note 4)
V
CC
= 1.95 V, (Note 3)
V
CC
= 1.95 V, (Note 4)
I
OZ
I
CC
DI
CC
2.
3.
4.
5.
3-State Output Current
Quiescent Supply Current (Note 5)
Increase in I
CC
per Input
V
O
= V
CC
or GND; V
CC
= 3.6 V;
V
I
= V
IH
or V
IL
1.65 V
≤
V
CC
≤
3.6 V; V
I
= GND or V
CC
2.7 V < V
CC
≤
3.6 V; V
IH
= V
CC
- 0.6 V
75
-75
45
-45
25
-25
450
-450
300
-300
200
-200
±10
20
750
mA
mA
mA
mA
V
CC
- 0.2
1.25
2.0
1.8
1.7
2.2
2.4
2.2
0.2
0.3
0.4
0.6
0.4
0.4
0.55
±5.0
mA
mA
V
Min
0.65 x V
CC
1.6
2.0
0.35 x V
CC
0.7
0.8
V
V
Max
Unit
V
These values of V
I
are used to test DC electrical characteristics only.
An external driver must source at least the specified current to switch from LOW-to-HIGH.
An external driver must sink at least the specified current to switch from HIGH-to-LOW.
Outputs disabled or 3-state only.
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4
74VCXH245
AC CHARACTERISTICS
(Note 6; t
R
= t
F
= 2.0 ns; C
L
= 30 pF; R
L
= 500
W)
Limits
T
A
= -40°C to +85°C
V
CC
= 3.0 V to 3.6 V
Symbol
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
t
OSHL
t
OSLH
Parameter
Propagation Delay
Input to Output
Output Enable Time to
High and Low Level
Output Disable Time From
High and Low Level
Output-to-Output Skew
(Note 7)
Waveform
1
2
2
Min
0.6
0.6
0.6
0.6
0.6
0.6
Max
3.5
3.5
4.5
4.5
3.6
3.6
0.5
0.5
V
CC
= 2.3 V to 2.7 V
Min
0.8
0.8
0.8
0.8
0.8
0.8
Max
4.2
4.2
5.6
5.6
4.0
4.0
0.5
0.5
V
CC
= 1.65 V to1.95 V
Min
1.5
1.5
1.5
1.5
1.5
1.5
Max
8.4
8.4
9.8
9.8
7.2
7.2
0.75
0.75
Unit
ns
ns
ns
ns
6. For C
L
= 50 pF, add approximately 300 ps to the AC maximum specification.
7. Skew is defined as the absolute value of the difference between the actual propagation delay for any two separate outputs of the same device.
The specification applies to any outputs switching in the same direction, either HIGH-to-LOW (t
OSHL
) or LOW-to-HIGH (t
OSLH
); parameter
guaranteed by design.
DYNAMIC SWITCHING CHARACTERISTICS
T
A
= +25°C
Symbol
V
OLP
Characteristic
Dynamic LOW Peak Voltage
(Note 8)
Condition
V
CC
= 1.8 V, C
L
= 30 pF, V
IH
= V
CC
, V
IL
= 0 V
V
CC
= 2.5 V, C
L
= 30 pF, V
IH
= V
CC
, V
IL
= 0 V
V
CC
= 3.3 V, C
L
= 30 pF, V
IH
= V
CC
, V
IL
= 0 V
V
OLV
Dynamic LOW Valley Voltage
(Note 8)
V
CC
= 1.8 V, C
L
= 30 pF, V
IH
= V
CC
, V
IL
= 0 V
V
CC
= 2.5 V, C
L
= 30 pF, V
IH
= V
CC
, V
IL
= 0 V
V
CC
= 3.3 V, C
L
= 30 pF, V
IH
= V
CC
, V
IL
= 0 V
V
OHV
Dynamic HIGH Valley Voltage
(Note 9)
V
CC
= 1.8 V, C
L
= 30 pF, V
IH
= V
CC
, V
IL
= 0 V
V
CC
= 2.5 V, C
L
= 30 pF, V
IH
= V
CC
, V
IL
= 0 V
V
CC
= 3.3 V, C
L
= 30 pF, V
IH
= V
CC
, V
IL
= 0 V
Typ
0.3
0.7
1.0
-0.3
-0.7
-1.0
1.3
1.7
2.0
V
V
Unit
V
8. Number of outputs defined as “n”. Measured with “n-1” outputs switching from HIGH-to-LOW or LOW-to-HIGH. The remaining output is
measured in the LOW state.
9. Number of outputs defined as “n”. Measured with “n-1” outputs switching from HIGH-to-LOW or LOW-to-HIGH. The remaining output is
measured in the HIGH state.
CAPACITIVE CHARACTERISTICS
Symbol
C
IN
C
OUT
C
PD
Parameter
Input Capacitance
Output Capacitance
Power Dissipation Capacitance
Condition
Note 10
Note 10
Note 10, 10 MHz
Typical
6
7
20
Unit
pF
pF
pF
10. V
CC
= 1.8, 2.5 or 3.3 V; V
I
= 0 V or V
CC
.
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