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IDTQS74FCT2827ATBT//CT
HIGH-SPEED CMOS BUS INTERFACE 10-BIT BUFFER INDUSTRIAL TEMPERATURE RANGE
MARCH 2002
2002 Integrated Device Technology, Inc. DSC-5258/4c
IDTQS74FCT2827AT/BT/CT
INDUSTRIAL TEMPERATURE RANGE
HIGH-SPEED CMOS
BUS INTERFACE
10-BIT BUFFER
DESCRIPTION:
The IDTQS74FCT2827T is a 10-bit buffer with 3-state outputs and a
25Ω resistor, useful for driving transmission lines and reducing system
noise. The 2827T series parts can replace the 827T 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
OE1
Yx
25Ω
Dx
OE2
FEATURES:
• 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 25ΩΩ
ΩΩ
Ω series resistor outputs reduce reflection and other
system noise
• A,B, and C speed grades with 4.4ns tPD for C
•IOL = 12mA
• Available in SOIC and QSOP packages
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INDUSTRIAL TEMPERATURE RANGE
IDTQS74FCT2827AT/BT/CT
HIGH-SPEED CMOS BUS INTERFACE 10-BIT BUFFER
SOIC/ QSOP
TOP VIEW
2
3
1V
CC
20
19
18
D4
D5
D3
D7
D6
D1
D2
D815
16
9
10
23
22
24
21
17
5
6
Y2
Y4
Y3
Y6
Y5
Y1
Y7
Y8
7
4
8
13
14
11
12
GND
OE1
OE2
D0
Y9
Y0
D9
PIN CONFIGURATION Symbol Description Max Unit
VTERM Terminal Voltage with Respect to GND –0.5 to +7 V
TSTG Storage Temperature –65 to +150 °C
IOUT DC Output Current Max Sink Current/Pin 120 mA
IIK Input Diode Current, VIN < 0 –20 mA
IOK Output Diode Current, VOUT < 0 –50 mA
ABSOLUTE MAXIMUM RATINGS(1)
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.
Symbol Parameter(1) Conditions Typ. Max. Unit
CIN Input Capacitance VIN = 0V 8 — pF
COUT Output Capacitance VOUT = 0V 8 — pF
CAPACITANCE (TA = +25°C, F = 1.0MHz)
NOTE:
1. This parameter is measured at characterization but not tested.
FUNCTION TABLE(1)
Inputs Outputs
OE1 OE2 Dx Yx Function
L L L L Transparent
L L H H Transparent
H X X Z High-Z
X H X Z High-Z
NOTE:
1. H = HIGH
L = LOW
X = Don't Care
Z = High-Impedance
PIN DESCRIPTION
Pin Names I/O Description
OEx I When both are LOW, the outputs are enabled.
When either one or both are HIGH, the outputs
are HIGH Z.
Dx I 10-Bit Data Inputs
Yx O 10-Bit Data Outputs
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IDTQS74FCT2827ATBT//CT
HIGH-SPEED CMOS BUS INTERFACE 10-BIT BUFFER INDUSTRIAL TEMPERATURE RANGE
Symbol Parameter Test Conditions Min. Typ.(1) Max. Unit
VIH Input HIGH Level Guaranteed Logic HIGH Level 2 — — V
VIL Input LOW Level Guaranteed Logic LOW Level — — 0.8 V
∆VTInput Hysteresis VTLH - VTHL for all inputs — 0.2 — V
IIH Input HIGH Current VCC = Max. 0 ≤ VIN ≤ VCC ——±5µA
IIL Input LOW Current
IOZ Off-State Output Current (Hi-Z) VCC = Max 0 ≤ VIN ≤ VCC ——±5µA
IOR Current Drive VCC = Max., VOUT = 2.0V(2) 50 — — mA
VIC Input Clamp Voltage VCC = Min, IIN = -18mA , TA = 25°C(2) — –0.7 –1.2 V
VOH Output HIGH Voltage VCC = Min. IOH = -15mA 2. 4 — — V
VOL Output LOW Voltage VCC = Min. I OL = 12mA — — 0.5 V
ROUT(3) Output Resistance VCC = Min. I OH = 12mA 18 25 40 Ω
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified:
Industrial: TA = –40°C to +85°C, VCC = 5.0V ± 5%
NOTES:
1. Typical values are at VCC = 5.0V, TA = 25°C.
2. This parameter is measured at characterization but not tested.
3. ROUT changed on March 8, 2002. See rear page for more information.
POWER SUPPLY CHARACTERISTICS
Following Conditions Apply Unless Otherwise Specified:
Industrial: TA = –40°C to +85°C, VCC = 5.0V ± 5%
Symbol Parameter Test Conditions(1) Min. Max. Unit
ICC Quiescent Power Supply Current VCC = Max. — 1.5 mA
freq = 0
0V ≤ VIN ≤ 0.2V or
VCC - 0.2V ≤ VIN ≤ Vcc
∆ICC Supply Current per Input TTL Inputs HIGH VCC = Max. — 2 mA
VIN = 3.4V(2)
freq = 0
ICCD Supply Current per Input per MHz VCC = Max. — 0.25 mA/MHz
Outputs Open and Enabled
One Bit Toggling
50% Duty Cycle
Other inputs at GND or Vcc(3,4)
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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INDUSTRIAL TEMPERATURE RANGE
IDTQS74FCT2827AT/BT/CT
HIGH-SPEED CMOS BUS INTERFACE 10-BIT BUFFER
FCT2827AT FCT2827BT FCT2827CT
Symbol Parameter(2) Min. Max. Min. Max. Min. Max. Unit
tPLH Propagation Delay — 8 — 5 — 4.4 ns
tPHL Dx to Yx
tPLH Propagation Delay — 17 — — — — ns
tPHL Dx to Yx(2,3)
tPZH Output Enable Time — 12 — 8 — 7 ns
tPZL OEx to Yx
tPZH Output Enable Time — 23 — — — — ns
tPZL OEx to Yx(2,3)
tPHZ Output Disable Time — 9 — 6 — 5.7 ns
tPLZ OEx to Yx(2,4)
tPHZ Output Disable Time — 10 — 7 — 6 ns
tPLZ OEx to Yx(2)
SWITCHING CHARACTERISTICS OVER OPERATING RANGE(1)
NOTES:
1. CLOAD = 50pF, RLOAD = 500Ω unless otherwise noted.
2. This parameter is guaranteed by design but not tested.
3. CLOAD = 300pF.
4. CLOAD = 5pF.
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IDTQS74FCT2827ATBT//CT
HIGH-SPEED CMOS BUS INTERFACE 10-BIT BUFFER INDUSTRIAL TEMPERATURE RANGE
Pulse
Generator
RT
D.U.T.
VCC
VIN
CL
VOUT
50pF 500W
500W
7.0V
3V
1.5V
0V
3V
1.5V
0V
3V
1.5V
0V
3V
1.5V
0V
DATA
INPUT
TIMING
INPUT
ASYNCHRONOUS CONTROL
PRESET
CLEAR
ETC.
SYNCHRONOUS CONTROL
tSU tH
tREM
tSU tH
HIGH-LOW-HIGH
PULSE
LOW-HIGH-LOW
PULSE
tW
1.5V
1.5V
SAME PHASE
INPUT TRANSITION
3V
1.5V
0V
1.5V
VOH
tPLH
OUTPUT
OPPOSITE PHASE
INPUT TRANSITION
3V
1.5V
0V
tPLH tPHL
tPHL
VOL
CONTROL
INPUT
3V
1.5V
0V
3.5V
0V
OUTPUT
NORMALLY
LOW
OUTPUT
NORMALLY
HIGH
SWITCH
CLOSED
SWITCH
OPEN
VOL
0.3V
0.3V
tPLZtPZL
tPZH tPHZ
3.5V
0V
1.5V
1.5V
ENABLE DISABLE
VOH
PRESET
CLEAR
CLOCK ENABLE
ETC.
FCTL link
FCTL link
FCTL link
FCTL link
FCTL link
TEST CIRCUITS AND WAVEFORMS
Propagation Delay Enable and Disable Times
Set-Up, Hold, and Release Times
Pulse Width
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.
Test Switch
Open Drain
Disable Low Closed
Enable Low
All Other Tests Open
SWITCH POSITION
DEFINITIONS:
CL = Load capacitance: includes jig and probe capacitance.
RT = Termination resistance: should be equal to ZOUT of the Pulse Generator.
Test Circuits for All Outputs
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INDUSTRIAL TEMPERATURE RANGE
IDTQS74FCT2827AT/BT/CT
HIGH-SPEED CMOS BUS INTERFACE 10-BIT BUFFER
ORDERING INFORMATION
High-Speed CMOS Bus Interface 10-Bit Buffer
2827AT
2827BT
2827CT
74 –40°C to +85°C
SO
QSmall Outline IC (gull wing)
Quarter Size Small Outline Package
IDTQS XX FCT XXXX XX
PackageDevice Type
Temp. Range
CORPORATE HEADQUARTERS for SALES: for Tech Support:
2975 Stender Way 800-345-7015 or 408-727-6116 logichelp@idt.com
Santa Clara, CA 95054 fax: 408-492-8674 (408) 654-6459
www.idt.com
Parameter Description Min. Typ. Max. Unit
ROUT VCC = Min, IOL = -15mA 20 28 40 Ω
As per PCN L0201-02, the Output Resistance (ROUT) specifications have changed as of March 8, 2002. The original specifications were:
