8-BIT TRANSCEIVER. CY74FCT2245T Datasheet

CY74FCT2245T TRANSCEIVER. Datasheet pdf. Equivalent

CY74FCT2245T Datasheet
Recommendation CY74FCT2245T Datasheet
Part CY74FCT2245T
Description 8-BIT TRANSCEIVER
Feature CY74FCT2245T; D Function and Pinout Compatible With FCT and F Logic D 25-Ω Output Series Resistors to Reduce Trans.
Manufacture etcTI
Datasheet
Download CY74FCT2245T Datasheet




Texas Instruments CY74FCT2245T
D Function and Pinout Compatible With FCT
and F Logic
D 25-Output Series Resistors to Reduce
Transmission-Line Reflection Noise
D Edge-Rate Control Circuitry for
Significantly Improved Noise
Characteristics
D Ioff Supports Partial-Power-Down Mode
Operation
D Fully Compatible With TTL Input and
Output Logic Levels
D ESD Protection Exceeds JESD 22
– 2000-V Human-Body Model (A114-A)
– 200-V Machine Model (A115-A)
– 1000-V Charged-Device Model (C101)
D 12-mA Output Sink Current
15-mA Output Source Current
D 3-State Outputs
CY74FCT2245T
8-BIT TRANSCEIVER
WITH 3-STATE OUTPUTS
SCCS037B – JULY 1994 – REVISED NOVEMBER 2001
P, Q, OR SO PACKAGE
(TOP VIEW)
T/R
A0
A1
A2
A3
A4
A5
A6
A7
GND
1
2
3
4
5
6
7
8
9
10
20 VCC
19 OE
18 B0
17 B1
16 B2
15 B3
14 B4
13 B5
12 B6
11 B7
description
The CY74FCT2245T contains eight noninverting, bidirectional buffers with 3-state outputs intended for
bus-oriented applications. On-chip termination resistors at the outputs reduce system noise caused by
reflections. For this reason, the CY74FCT2245T can replace the CY74FCT245T in an existing design. The
CY74FCT2245T current-sinking capability is 12 mA at 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 (OE) input, when high, disables both the A and B ports by putting them in the
high-impedance state.
This device is fully specified for partial-power-down applications using Ioff. The Ioff circuitry disables the outputs,
preventing damaging current backflow through the device when it is powered down.
ORDERING INFORMATION
TA
PACKAGE†
SPEED
(ns)
ORDERABLE
PART NUMBER
TOP-SIDE
MARKING
QSOP – Q Tape and reel
4.1
CY74FCT2245CTQCT
FCT2245
Tube
4.1 CY74FCT2245CTSOC
SOIC – SO
FCT2245
Tape and reel 4.1 CY74FCT2245CTSOCT
DIP – P
Tube
4.6 CY74FCT2245ATPC
74FCT2245ATPC
QSOP – Q Tape and reel 4.6 CY74FCT2245ATQCT FCT2245A
–40°C to 85°C
Tube
4.6 CY74FCT2245ATSOC
SOIC – SO
FCT2245A
Tape and reel 4.6 CY74FCT2245ATSOCT
QSOP – Q Tape and reel 7.0 CY74FCT2245TQCT
FCT2245
Tube
7.0 CY74FCT2245TSOC
SOIC – SO
FCT2245
Tape and reel 7.0 CY74FCT2245TSOCT
Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are
available at www.ti.com/sc/package.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
Copyright 2001, Texas Instruments Incorporated
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Texas Instruments CY74FCT2245T
CY74FCT2245T
8-BIT TRANSCEIVER
WITH 3-STATE OUTPUTS
SCCS037B JULY 1994 REVISED NOVEMBER 2001
FUNCTION TABLE
INPUTS
OE T/R
OUTPUT
L L Bus B data to bus A
L H Bus A data to bus B
HX
Z
H = High logic level, L = Low logic level,
X = Dont care, Z = High-impedance state
logic diagram (positive logic)
1
T/R
19
OE
A0 2
18
B0
To Seven Other Channels
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage range to ground potential . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.5 V to 7 V
DC input voltage range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.5 V to 7 V
DC output voltage range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.5 V to 7 V
DC output current (maximum sink current/pin) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120 mA
Package thermal impedance, θJA (see Note 1): P package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69°C/W
Q package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68°C/W
SO package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58°C/W
Ambient temperature range with power applied, TA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65°C to 135°C
Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65°C to 150°C
Stresses beyond those listed under absolute maximum ratingsmay cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under recommended operating conditionsis not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
NOTE 1: The package thermal impedance is calculated in accordance with JESD 51-7.
recommended operating conditions (see Note 2)
MIN NOM MAX UNIT
VCC Supply voltage
VIH High-level input voltage
VIL Low-level input voltage
IOH High-level output current
IOL Low-level output current
TA Operating free-air temperature
NOTE 2: All unused inputs of the device must be held at VCC or GND to ensure proper device operation.
4.75
2
40
5 5.25 V
V
0.8 V
15 mA
12 mA
85 °C
2 POST OFFICE BOX 655303 DALLAS, TEXAS 75265



Texas Instruments CY74FCT2245T
CY74FCT2245T
8-BIT TRANSCEIVER
WITH 3-STATE OUTPUTS
SCCS037B JULY 1994 REVISED NOVEMBER 2001
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
MIN TYPMAX UNIT
VIK
VCC = 4.75,
IIN = 18 mA
0.7 1.2 V
VOH
VCC = 4.75,
IOH = 15 mA
2.4 3.3
V
VOL
VCC = 4.75,
IOL = 12 mA
0.3 0.55 V
Rout
VCC = 4.75,
IOL = 12 mA
20 25 40
Vhys
All inputs
0.2 V
II
VCC = 5.25 V,
VIN = VCC
5 µA
IIH
VCC = 5.25 V,
VIN = 2.7 V
±1 µA
IIL
VCC = 5.25 V,
VIN = 0.5 V
±1 µA
IOZH
VCC = 5.25 V,
VOUT = 2.7 V
10 µA
IOZL
IOS
VCC = 5.25 V,
VCC = 5.25 V,
VOUT = 0.5 V
VOUT = 0 V
10
60 120 225
µA
mA
Ioff
VCC = 0 V,
VOUT = 4.5 V
±1 µA
ICC
ICC
VCC = 5.25 V,
VIN 0.2 V,
VIN VCC 0.2 V
VCC = 5.25 V, VIN = 3.4 V§, f1 = 0, Outputs open
0.1 0.2 mA
0.5 2 mA
ICCD
VCC = 5.25 V, One input switching at 50% duty cycle, Outputs open,
T/R = OE = GND, VIN 0.2 V or VIN VCC 0.2 V
0.06
0.12
mA/
MHz
One input switching
VIN 0.2 V or
at f1 = 10 MHz
VIN VCC 0.2 V
IC#
VCC = 5.25 V,
Outputs open,
T/R = OE = GND
at 50% duty cycle
Eight bits switching
VIN = 3.4 V or GND
VIN 0.2 V or
at f1 = 2.5 MHz
VIN VCC 0.2 V
at 50% duty cycle
VIN = 3.4 V or GND
0.7 1.4
1 2.4
1.3 2.6||
3.3 10.6||
mA
Ci 5 10 pF
Co 9 12 pF
Typical values are at VCC = 5 V, TA = 25°C.
Not more than one output should be shorted at a time. Duration of short should not exceed one second. The use of high-speed test apparatus
and/or sample-and-hold techniques are preferable to minimize internal chip heating and more accurately reflect operational values. Otherwise,
prolonged shorting of a high output can raise the chip temperature well above normal and cause invalid readings in other parametric tests. In
any sequence of parameter tests, IOS tests should be performed last.
§ Per TTL-driven input (VIN = 3.4 V); all other inputs at VCC or GND
This parameter is derived for use in total power-supply calculations.
# IC = ICC + ICC × DH × NT + ICCD (f0/2 + f1 × N1)
Where:
IC = Total supply current
ICC = Power-supply current with CMOS input levels
ICC = Power-supply current for a TTL high input (VIN = 3.4 V)
DH = Duty cycle for TTL inputs high
NT = Number of TTL inputs at DH
ICCD = Dynamic current caused by an input transition pair (HLH or LHL)
f0 = Clock frequency for registered devices, otherwise zero
f1 = Input signal frequency
N1 = Number of inputs changing at f1
All currents are in milliamperes and all frequencies are in megahertz.
|| Values for these conditions are examples of the ICC formula.
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
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