Page 1
74LCXR2245
Low Voltage Bidirectional Transceiver with
5V Tolerant Inputs and Outputs and
26
Ω Series Resistors on Both A and B Ports
October 2000
Revised October 2000
Resistors on Both A and B Ports
74LCXR2245 Low Voltage Bidirectional Transceiver with 5V Tolerant Inputs and Outputs and 26
General Description
The LCXR2245 contains eight non-inverting bidirectional
buffers with 3-STATE outputs and is in tended for bus oriented applications. The device is designed fo r low voltage
(2.5V and 3.3V) V
ing to a 5V signal en vironment. The T /R
the direction of d ata flo w t hro ugh t he de vi ce. T he O E
disables both the A and B ports by placing them in a high
impedance state. The 26
output overshoot and undershoot.
The LCXR2245 is fabricated with an advanced CMOS
technology to achieve high speed operation while maintaining CMOS low power dissipation.
applications with capability of interfac-
CC
Ω series resistor helps reduce
input determines
input
Features
■ 5V tolerant inputs and outputs
■ 2.3V–3.6V V
■ 8.0 ns t
■ Power down high impedance inputs and outputs
■ Supports live insertion/withdrawal (Note 1)
■
±12 mA output drive (V
■ Implements patented noise/EMI reduction circuitry
■ Latch-up performance exce eds 500 mA
■ Equivalent 26
■ ESD performance:
Human body model
Machine model
Note 1: To ensure the high-impedance state during power up or down, OE
should be tied to VCC through a pull-up res istor: the m inimu m value or t he
resistor is determin ed by the current-sourc ing capability of the driver.
specifications provided
CC
max (V
PD
= 3.3V), 10 µA I
CC
= 3.0V)
CC
Ω series resistor on all outputs
> 2000V
> 200V
max
CC
Ordering Code:
Order Number Package Number Package Description
74LCXR2245WM M20B 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide
74LCXR2245SJ M20D 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
74LCXR2245MSA MSA20 20-Lead Shrink Small Outline Package (SSOP), EIAJ TYPE II, 5.3mm Wide
74LCXR2245MTC MTC20 20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
Devices also availab l e in Tape and Reel. Specify by appending th e s uffix let t er “X” to the ordering code.
Logic Symbol
Connection Diagram
Pin Descriptions
Pin Names Description
OE
T/R
A
0–A7
B
0–B7
© 2000 Fairchild Semiconductor Corporation DS500361 www.fairchildsemi.com
Output Enable Input
Transmit/Receive Input
Side A Inputs or 3-STATE Outputs
Side B Inputs or 3-STATE Outputs
Ω
Series
Page 2
Truth Table
Inputs
74LCXR2245
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
Z = High Impedance
Note 2: Unused bus termina ls during HIGH Z State must be held HIGH or LO W.
OE
T/R
L L Bus B0 – B7 Data to Bus A0 – A
L H Bus A0 – A7 Data to Bus B0 – B
H X HIGH Z State on A0 – A7, B0 – B7 (Note 2)
Logic Diagram
Outputs
7
7
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Page 3
Absolute Maximum Ratings(Note 3)
Symbol Parameter Value Conditions Units
V
V
V
I
I
I
I
I
T
CC
I
O
IK
OK
O
CC
GND
STG
Supply Voltage −0.5 to +7.0 V
DC Input Voltage −0.5 to +7.0 V
DC Output Voltage −0.5 to +7.0 Output in 3-STATE
−0.5 to V
+ 0.5 Output in HIGH or LOW State (Note 4)
CC
DC Input Diode Current −50 VI < GND mA
DC Output Diode Current −50 VO < GND
+50 V
O
> V
CC
DC Output Source/Sink Current ±50 mA
DC Supply Current per Supply Pin ±100 mA
DC Ground Current per Ground Pin ±100 mA
Storage Temperature −65 to +150 °C
Recommended Operating Conditions (Note 5)
Symbol Parameter Min Max Units
V
CC
V
I
V
O
I
OH/IOL
T
A
∆t/∆V Input Edge Rate, V
Note 3: The Absolute Maximum Ratings are those values beyond which the safety of the device cannot be guaranteed. The device should not be operated
at these limits. The parametric values defined in the Electrical Characteristics tables are not guaranteed at the Absolute Maximum Ratings. The “Recom-
mended Operating Conditions” table will define th e c onditions for actual dev ic e operation.
Note 4: I
Note 5: Unused inputs or I/O pins m us t be held HIGH or LOW. They may not float.
Supply Voltage Operating 2.0 3.6
Data Retention 1.5 3.6
Input Voltage 05.5V
Output Voltage HIGH or LOW State 0 V
CC
3-STATE 0 5.5
Output Current VCC = 3.0V − 3.6V ±12
= 2.7V - 3.0V ±8
CC
V
= 2.3V - 2.7V ±4
CC
mAV
Free-Air Operating T emperature −40 85 °C
= 0.8V − 2.0V, VCC = 3.0V 0 10 ns/V
IN
Absolute Maximum Rating must be observed.
O
74LCXR2245
V
mA
V
V
DC Electrical Characteristics
Symbol Parameter Conditions
V
IH
V
IL
V
OH
V
OL
I
I
I
OZ
HIGH Level Input Voltage 2.3 − 2.7 1.7
LOW Level Input Voltage 2.3 − 2.7 0.7
HIGH Level Output Voltage IOH = −100 µA 2.3 - 3.6 VCC − 0.2
IOH = −4 mA 2.3 1.8
IOH = −4 mA 2.7 2.2
IOH = −6 mA 3.0 2.4
IOH = −8 mA 2.7 2.0
IOH = −12 mA 3.0 2.0
LOW Level Output Voltage IOL = 100 µA2.3 − 3.6 0.2
IOL = 4 mA 2.3 0.6
IOL = 4 mA 2.7 0.4
IOL = 6 mA 3.0 0.55
IOL = 8 mA 2.7 0.6
IOL = 12 mA 3.0 0.8
Input Leakage Current 0 ≤ VI ≤ 5.5V 2.3 − 3.6 ±5.0 µA
3-STATE I/O Leakage 0 ≤ VO ≤ 5.5V
VI = VIH or V
V
CC
(V) Min Max
2.7 − 3.6 2.0
2.7 - 3.6 0.8
IL
2.3 − 3.6 ±5.0 µA
TA = −40°C to +85°C
3 www.fairchildsemi.com
Units
V
V
V
V
Page 4
DC Electrical Characteristics (Continued)
Symbol Parameter Conditions
I
OFF
74LCXR2245
I
CC
Power-Off Leakage Current VI or VO = 5.5V 0 10 µA
Quiescent Supply Current VI = VCC or GND 2.3 − 3.6 10
3.6V ≤ V
∆I
CC
Note 6: Outputs disabled or 3- STATE only.
Increase in ICC per Input VIH = VCC −0.6V 2.3 - 3.6 500 µA
V
CC
(V) Min Max
, VO ≤ 5.5V (Note 6) 2.3 − 3.6 ±10
I
TA = −40°C to +85°C
AC Electrical Characteristics
= −40°C to +85°C, RL = 500Ω
T
A
Symbol Parameter
V
= 3.3V ± 0.3V VCC = 2.7V VCC = 2.5V ± 0.2V
CC
= 50 pF CL = 50 pF CL = 30 pF
C
L
Min Max Min Max Min Max
t
PHL
t
PLH
t
PZL
t
PZH
t
PLZ
t
PHZ
t
OSHL
t
OSLH
Note 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 sw it c hing in the same direction, either HIGH-to-LOW (t
Propagation Delay 1.5 8.0 1.5 9.0 1.5 9.6
An to Bn or Bn to A
n
1.5 8.0 1.5 9.0 1.5 9.6
Output Enable Time 1.5 9.5 1.5 10.5 1.5 11.0
1.5 9.5 1.5 10.5 1.5 11.0
Output Disable Time 1.5 7.5 1.5 8.5 1.5 9.0
1.5 7.5 1.5 8.5 1.5 9.0
Output to Output Skew 1.0
(Note 7) 1.0
) or LOW-to-HIGH (t
OSHL
OSLH
).
Dynamic Switching Characteristics
T
Symbol Parameter Conditions
V
OLP
V
OLV
Quiet Output Dynamic Peak V
Quiet Output Dynamic Valley V
OL
OL
CL = 50 pF, VIH = 3.3V, VIL = 0V 3.3 0.5
= 30 pF, VIH = 2.5V, VIL = 0V 2.5 0.4
C
L
CL = 50 pF, VIH = 3.3V, V IL = 0V 3.3 0.5
CL = 30 pF, VIH = 2.5V, VIL = 0V 2.5 0.4
V
CC
(V)
= 25°C
A
Typical
Units
µA
Units
ns
ns
ns
ns
Units
V
V
Capacitance
Symbol Parameter Conditions Typical Units
C
IN
C
I/O
C
PD
Input Capacitance VCC = Open, VI = 0V or V
Input/Output Capacitance VCC = 3.3V, VI = 0V or V
Power Dissipation Capacitance VCC = 3.3V, VI = 0V or VCC, f = 10 MHz 25 pF
www.fairchildsemi.com 4
CC
CC
7pF
8pF
Page 5
AC LOADING and WAVEFORMS Generic for LCX Family
74LCXR2245
FIGURE 1. AC Test Circuit (C
Test Switch
, t
t
PLH
PHL
t
, t
PZL
PLZ
t
PZH,tPHZ
Waveform for Inverting and Non-Inverting Functions
Propagation Delay. Pulse Width and t
Waveforms
rec
includes prob e and jig capacitance)
L
Open
6V at VCC = 3.3 ± 0.3V
x 2 at VCC = 2.5 ± 0.2V
V
CC
GND
3-STATE Output High Enable and
Disable Times for Logic
Setup Time, Hol d Time and Recovery Time for Logic
3-STATE Output Low Enable and
Disable Times for Logic
(Input Characteristics; f =1MHz, t
Symbol
V
mi
V
mo
V
x
V
y
3.3V ± 0.3V 2.7V 2.5V ± 0.2V
1.5V 1.5V VCC/2
1.5V 1.5V VCC/2
VOL + 0.3V VOL + 0.3V VOL + 0.15V
VOH − 0.3V VOH − 0.3V VOH − 0.15V
FIGURE 2. Waveforms
V
CC
5 www.fairchildsemi.com
= tF = 3ns)
R
t
rise
and t
fall
Page 6
Schematic Diag r a m Generic for LCX Family
74LCXR2245
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Page 7
Physical Dimensions inches (millimeters) unless otherwise noted
74LCXR2245
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide
Package Number M20B
7 www.fairchildsemi.com
Page 8
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
74LCXR2245
20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
www.fairchildsemi.com 8
Package Number M20D
Page 9
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
74LCXR2245
20-Lead Shrink Small Outline Package (SSOP), EIAJ TYPE II, 5.3mm Wide
Package Number MSA20
9 www.fairchildsemi.com
Page 10
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
Series
Ω
Resistors on Both A and B Ports
20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
Fairchild does not assume any responsibility for use of any circuitr y described, no circuit patent licenses are implied a nd
Fairchild reserves the right at any time without notice to change said circuitry and specifications.
LIFE SUPPORT POLICY
FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD
SEMICONDUCTOR CORPORATION. As used herein:
1. Life support devices or systems are device s or syste ms
74LCXR2245 Low Voltage Bidirectional Transceiver with 5V Tolerant Inputs and Outputs and 26
which, (a) are intended for surgical implant into the
body, or (b) support or sustain life, and (c) whose failure
to perform when properly used in accordance with
instructions for use provided in the labeling, can be reasonably expected to result in a significant inju ry to the
user.
www.fairchildsemi.com 10
Package Number MTC20
2. A critical component in any compon ent of a l ife supp ort
device or system whose failu re to perform can be reasonably expected to cause the failure of the li fe su pp ort
device or system, or to affect its safety or effectiveness.
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