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IDTQS74FCT2541T/AT/CT HIGH-SPEED CMOS 8-INPUT BUFFER/LINE DRIVER
INDUSTRIAL TEMPERATURE RANGE
HIGH-SPEED CMOS 8-INPUT BUFFER/LINE DRIVER
FEATURES:
* * * * * *
IDTQS74FCT2541T/AT/CT
CMOS power levels: <7.5mW static Undershoot clamp diodes on all outputs True TTL input and output compatibility Ground bounce controlled outputs Reduced output swing of 0 to 3.5V Built-in 25 series resistor outputs reduce reflection and other system noise * Std., A and C speed grades with 4.1ns tPD for C * IOL = 12mA * Available in SOIC and QSOP packages
DESCRIPTION:
The IDTQS74FCT2541T is an 8-bit buffer/line driver with 3-state outputs and a 25 resistor output , ideal for driving transmission lines and reducing system noise. The 2540 series parts can replace the 540 series to reduce noise in an existing design. All inputs have clamp diodes for undershoot noise suppression. All outputs have ground bounce suppression. Outputs will not load an active bus when Vcc is removed from the device.
FUNCTIONAL BLOCK DIAGRAM
O E1 OE2
A0
2
18
Y0
A4
6
14
Y4
A1
3
17
Y1
A5
7
13
Y5
A2
4
16
Y2
A6
8
12
Y6
A3
5
15
Y3
A7
9
11
Y7
INDUSTRIAL TEMPERATURE RANGE
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c 2000 Integrated Device Technology, Inc.
DECEMBER 2000
DSC-5250/3
IDTQS74FCT2541T/AT/CT HIGH-SPEED CMOS 8-INPUT BUFFER/LINE DRIVER
INDUSTRIAL TEMPERATURE RANGE
PIN CONFIGURATION
ABSOLUTE MAXIMUM RATINGS(1)
Symbol VTERM TSTG IOUT IIK IOK Description Terminal Voltage with Respect to GND Storage Temperature DC Output Current Max Sink Current/Pin Input Diode Current, VIN < 0 Output Diode Current, VOUT < 0 Max -0.5 to +7 -65 to +150 120 -20 -50 Unit V C mA mA mA
OE1 A0 A1 A2 A3 A4 A5 A6 A7 GND
1 2 3 4 5 6 7 8 9 10
SO20-2 SO20-8
20 19 18 17 16 15 14 13 12 11
VCC OE2 Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7
NOTE: 1. Stresses greater than those listed under ABSOLUTE MAXIMUM RATINGS may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability.
CAPACITANCE (TA = +25C, F = 1.0MHz)
Symbol CIN COUT Parameter(1) Input Capacitance Output Capacitance Conditions VIN = 0V VOUT = 0V Typ. 4 8 Max. -- -- Unit pF pF
NOTE: 1. This parameter is measured at characterization but not tested.
SOIC/ QSOP TOP VIEW
PIN DESCRIPTION
Pin Names Ax Yx OE1, OE2 I/O I O I Description Data Inputs Data Outputs 3-State Output Enable (Active LOW)
FUNCTION TABLE(1)
OE1 H X L L OE2 X H L L A Inputs X X L H Y Outputs Z Z L H Enable Outputs Function Disable Outputs
NOTE: 1. H = HIGH Voltage Level L = LOW Voltage Level X = Don't Care Z = High-Impedance
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IDTQS74FCT2541T/AT/CT HIGH-SPEED CMOS 8-INPUT BUFFER/LINE DRIVER
INDUSTRIAL TEMPERATURE RANGE
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified: Industrial: TA = -40C to +85C, VCC = 5.0V 5%
Symbol VIH VIL VT IIH IIL IOZ IOR VIC VOH VOL ROUT Parameter Input HIGH Level Input LOW Level Input Hysteresis Input HIGH Current Input LOW Current Off-State Output Current (Hi-Z) Current Drive Input Clamp Voltage Output HIGH Voltage Output LOW Voltage Output Resistance VCC = Max 2V(2) 0 VIN VCC -- 50 -- 2.4 -- 20 -- -- -0.7 -- -- 28 5 -- -1.2 -- 0.5 40 A mA V V V VCC = Max., VOUT = VCC = Min, IIN = -18mA , TA = 25C(2) VCC = Min. VCC = Min. VCC = Min. IOH = -15mA IOL = 12mA IOL = 12mA Test Conditions Guaranteed Logic HIGH Level Guaranteed Logic LOW Level VTLH - VTHL for all inputs VCC = Max. 0 VIN VCC Min. 2 -- -- -- Typ.(1) -- -- 0.2 -- Max. -- 0.8 -- 5 Unit V V V A
NOTES: 1. Typical values are at VCC = 5.0V, TA = 25C. 2. This parameter is guaranteed but not tested.
POWER SUPPLY CHARACTERISTICS
Following Conditions Apply Unless Otherwise Specified: Industrial: TA = -40C to +85C, VCC = 5.0V 5% Symbol ICC Parameter Quiescent Power Supply Current Test Conditions(1) VCC = Max. freq = 0 0V VIN 0.2V or VCC - 0.2V VIN Vcc VCC = Max. VIN = 3.4V(2) freq = 0 VCC = Max. Outputs Open and Enabled One Bit Toggling 50% Duty Cycle Other inputs at GND or Vcc(3,4) Min. -- Max. 1.5 Unit mA
ICC
Supply Current per Input TTL Inputs HIGH
--
2
mA
ICCD
Supply Current per Input per MHz
--
0.25
mA/MHz
NOTES: 1. For conditions shown as Min. or Max., use the appropriate values specified under DC Electrical Characteristics. 2. Per TLL driven input (VIN = 3.4V). 3. For flip-flops, ICCD is measured by switching one of the data input pins so that the output changes every clock cycle. This is a measurement of device power consumption only and does not include power to drive load capacitance or tester capacitance. 4. IC = IQUIESCENT + IINPUTS + IDYNAMIC IC = ICC + ICC DHNT + ICCD (fCP/2 + fiNi) ICC = Quiescent Current ICC = Power Supply Current for a TTL High Input (VIN = 3.4V) DH = Duty Cycle for TTL Inputs High NT = Number of TTL Inputs at DH ICCD = Dynamic Current Caused by an Output Transition Pair (HLH or LHL) fCP = Clock Frequency for Register Devices (Zero for Non-Register Devices) fi = Input Frequency Ni = Number of Inputs at fi All currents are in milliamps and all frequencies are in megahertz.
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IDTQS74FCT2541T/AT/CT HIGH-SPEED CMOS 8-INPUT BUFFER/LINE DRIVER
INDUSTRIAL TEMPERATURE RANGE
SWITCHING CHARACTERISTICS OVER OPERATING RANGE(1)
Symbol tPLH tPHL tPZH tPZL tPLZ tPHZ Parameter(2) Propagation Delay Ax to Yx Output Enable OE to Yx Disable Time(3) FCT2541T Min. Max. 2 8 1.5 1.5 10 9.5 FCT2541AT Min. Max. 2 4.8 1.5 1.5 6.2 5.6 FCT2541CT Min. Max. 2 4.1 1.5 1.5 5.8 5.2 Unit ns ns ns
NOTES: 1. CLOAD = 50pF, RLOAD = 500 unless otherwise noted. 2. Minimums guaranteed but not tested. 3. This parameter is guaranteed by design but not tested.
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IDTQS74FCT2541T/AT/CT HIGH-SPEED CMOS 8-INPUT BUFFER/LINE DRIVER
INDUSTRIAL TEMPERATURE RANGE
TEST CIRCUITS AND WAVEFORMS
VCC 500 Pulse Generator VIN D.U.T. 50pF RT CL 500 VOUT
7.0V
SWITCH POSITION
Test Open Drain Disable Low Enable Low All Other Tests Switch Closed Open
DEFINITIONS: CL = Load capacitance: includes jig and probe capacitance. RT = Termination resistance: should be equal to ZOUT of the Pulse Generator.
FCTL link
Test Circuits for All Outputs
DATA INPUT TIMING INPUT ASYNCHRONOUS CONTROL PRESET CLEAR ETC. SYNCHRONOUS CONTROL PRESET CLEAR CLOCK ENABLE ETC.
tSU
tH
tREM
3V 1.5V 0V 3V 1.5V 0V 3V 1.5V 0V 3V 1.5V 0V
FCTL link
LOW-HIGH-LOW PULSE tW HIGH-LOW-HIGH PULSE
FCTL link
1.5V
1.5V
tSU
tH
Pulse Width
Set-Up, Hold, and Release Times
ENABLE SAME PHASE INPUT TRANSITION tPLH OUTPUT tPLH OPPOSITE PHASE INPUT TRANSITION tPHL tPHL 3V 1.5V 0V VOH 1.5V VOL 3V 1.5V 0V
FCTL link
DISABLE 3V 1.5V
CONTROL INPUT tPZL OUTPUT NORMALLY LOW OUTPUT NORMALLY HIGH SWITCH CLOSED tPZH SWITCH OPEN 3.5V 1.5V tPHZ 0.3V 1.5V 0V tPLZ
0V 3.5V 0.3V VOL VOH 0V
FCTL link
Propagation Delay
Enable and Disable Times
NOTES: 1. Diagram shown for input Control Enable-LOW and input Control Disable-HIGH. 2. Pulse Generator for All Pulses: Rate 1.0MHz; tF 2.5ns; tR 2.5ns.
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IDTQS74FCT2541T/AT/CT HIGH-SPEED CMOS 8-INPUT BUFFER/LINE DRIVER
INDUSTRIAL TEMPERATURE RANGE
ORDERING INFORMATION
IDTQS XX XXXX FCT Device Type Temp. Range XX Package
SO Q
Small Outline IC (gull wing) (SO20-2) Quarter Size Small Outline Package (SO20-8)
2541T High-Speed CMOS 8-Bit Buffer/Line Driver 2541AT 2541CT 74 -40C to +85C
CORPORATE HEADQUARTERS 2975 Stender Way Santa Clara, CA 95054
for SALES: 800-345-7015 or 408-727-6116 fax: 408-492-8674 www.idt.com
for Tech Support: logichelp@idt.com (408) 654-6459
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