Fairchild Semiconductor 74LCXH245 Datasheet
October 2000
Revised September 2001
74LCXH245
Low Voltage Bidirectional Transceiver with Bushold
74LCXH245 Low Voltage Bidirectional Transceiver with Bushold
General Description
The LCXH245 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
mines the direction of data flow through the device. The OE
input disables both the A and B ports by placin g them in a
high impedance state.
The LCXH245 is fabricate d with an advanced CMOS tec hnology to achieve high s peed operation while maintaining
CMOS low power dissipati o n. T he LCX H16 244 dat a i np uts
include active bushold circuitry, eliminating the need for
external pull-up resi stors to hold unused or floa ting data
inputs at a valid logic level.
applications. The T/R input deter-
CC
Features
■ 5V tolerant control inputs
■ 2.3V–3.6V V
■ 7.0 ns t
■ Power down high impedance outputs
■
±24 mA output drive (V
■ Implements patented noise/EMI reduction circuitry
■ Latch-up performance exce eds 500 mA
■ Bushold on inputs eliminates the need for external
pull-up/pull-down resistors
■ ESD performance:
Human body model
Machine model
specifications provided
CC
max (V
PD
CC
> 2000V
> 200V
= 3.3V), 10 µA I
= 3.0V)
CC
max
CC
Ordering Code:
Order Number Package Number Package Description
74LCXH245WM M20B 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide
74LCXH245SJ M20D 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
74LCXH245MSA MSA20 20-Lead Shrink Small Outline Package (SSOP), EIAJ TYPE II, 5.3mm Wide
74LCXH245MTC 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
GTO is a trademark of Fa irc hild Semiconduct or C orporation.
© 2001 Fairchild Semiconductor Corporation DS500363 www.fairchildsemi.com
Output Enable Input
Transmit/Receive Input
Side A Inputs or 3-STATE Outputs (Bushold)
Side B Inputs or 3-STATE Outputs (Bushold)
Truth Table
74LCXH245
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
Z = High Impedance
Note 1: Unused bus termina ls during HIGH Z State must be held HIGH or LO W.
Inputs
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 1)
Logic Diagram
Outputs
7
7
www.fairchildsemi.com 2
Absolute Maximum Ratings(Note 2)
Symbol Parameter Value Conditions Units
V
V
V
I
IK
I
OK
I
O
I
CC
I
GND
T
CC
I
O
STG
Supply Voltage −0.5 to +7.0 V
T/R, OE 0.5 to +7.0 V
I/O Ports
−0.5 to V
CC
+ 0.5
DC Output Voltage −0.5 to +7.0 Output in 3-STATE
−0.5 to V
+ 0.5 Output in HIGH or LOW St ate (Note 3)
CC
DC Input Diode Current −50 VI < GND mA
DC Output Diode Current −50 VO < GND
+50 V
O
> V
CC
mA
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 4)
Symbol Parameter Min Max Units
V
CC
V
I
V
O
I
OH/IOL
T
A
∆t/∆V Input Edge Rate, V
Note 2: 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 devic e operation.
Note 3: I
Note 4: Floati ng or unused control in puts must be HIGH or LOW.
Supply Voltage Operating 2.0 3.6
Data Retention 1.5 3.6
Input Voltage 0VCCV
Output Voltage HIGH or LOW State 0 V
CC
3-STATE 0 5.5
Output Current VCC = 3.0V − 3.6V ±24
= 2.7V - 3.0V ±12
CC
V
= 2.3V - 2.7V ±8
CC
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
V
V
mAV
74LCXH245
V
DC Electrical Characteristics
Symbol Parameter Conditions
V
IH
V
IL
V
OH
V
OL
I
I
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 = −8 mA 2.3 1.8
IOH = −12 mA 2.7 2.2
IOH = −18 mA 3.0 2.4
IOH = −24 mA 3.0 2.2
LOW Level Output Voltage IOL = 100 µA2.3 − 3.6 0.2
IOL = 8mA 2.3 0.6
IOL = 12 mA 2.7 0.4
IOL = 16 mA 3.0 0.4
IOL = 24 mA 3.0 0.55
Input Leakage Current VI = VCC or GND 2.3 − 3.6 ±5.0 µA
V
CC
(V) Min Max
2.7 − 3.6 2.0
2.7 - 3.6 0.8
TA = −40°C to +85°C
Units
V
V
V
V
3 www.fairchildsemi.com
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