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IDTQS3800
HIGH-SPEED CMOS 10-BIT QUICKSWITCH WITH PRECHARGED OUTPUTS INDUSTRIAL TEMPERATURE RANGE
MAY 2000
1999 Integrated Device Technology, Inc. DSC-5766/-c
IDTQS3800
INDUSTRIAL TEMPERATURE RANGE
QUICKSWITCH® PRODUCTS
HIGH-SPEED CMOS
10-BIT QUICKSWITCH WITH
PRECHARGED OUTPUTS
A0
A9
VBIAS
B9
ON
B0
FUNCTIONAL BLOCK DIAGRAM
DESCRIPTION
The QS3800 is a 10-bit high-speed CMOS bus switch controlled by a
single enable (ON) input. When ON is low, the switch is on and port A is
connected to port B. When ON is high, the switch between port A and port
B is open and port B is precharged to the Bias voltage. The low ON resistance
(5Ω) of the QS3800 allows inputs to be connected to outputs without adding
propagation delay and without generating additional noise. The QS3800
also precharges the B port to a user-selectable bias voltage to minimize live-
insertion noise which is uselful in VME bus applications.
The QS3800 is characterized for operation at -40°C to +85°C.
FEATURES:
− 5Ω bidirectional switches connect in puts to outputs
− Zero propagation delay, zero ground bounce
− Undershoot clamp diodes on all switch and control inputs
− Outputs precharge voltage to minimize signal distortion during live
insertion
− TTL-compatible input and output levels
− Available in QSOP, SOIC, and TSSOP Packages
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INDUSTRIAL TEMPERATURE RANGE
IDTQS3800
HIGH-SPEED CMOS 10-BIT QUICKSWITCH WITH PRECHARGED OUTPUTS
PIN CONFIGURATION
SOIC/ QSOP/ TSSOP
TOP VIEW
24
23
22
21
20
19
18
17
16
15
14
13
VCC
B0
B1
B2
B3
B4
B5
B6
B7
B8
B9
VBIAS
ON
A0
A1
A2
A3
A4
A5
A6
A7
A8
A9
GND
1
2
3
4
5
6
7
8
9
10
11
12
SO24-2
SO24-8
SO24-9
ABSOLUTE MAXIMUM RATINGS (1)
Symbol Description Max. Unit
VTERM(2) Supply Voltage to Ground – 0.5 to +7 V
VBIAS Bias Voltage Range – 0.5 to Vcc V
VTERM(3) DC Input Voltage VIN – 0.5 to
Vcc + 0.5 V
VAC AC Input Voltage (pulse width ≤20ns) -3 V
IOUT DC Output Current 120 mA
Input Clamp Current -50 mA
PMAX Maximum Power Dissipation (TA = 85°C) 0.5 W
TSTG Storage Temperature – 65 to +150 °C
NOTES:
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 c onditions abov e those i ndicated in the ope rational s ections
of this specification is not implied. Exposure to absolute maximum
rating conditions for ext ended periods may aff ect reliability .
2. Vcc Terminals.
3. All termi nals except Vcc.
CAPACITANCE
(TA = +25OC, f = 1.0MHz, VIN = 0V, VOUT = 0V)
Pins Typ. Max. (1) Unit
Control Pins 3 5 pF
Quickswitch Channels (Switch OFF) 5 7 pF
NOTE:
1. This parameter is guaranteed but not production tested.
PIN DESCRIPTION
Pin Names I/O Description
A0 - A9I/O Bus A
B0 - B9I/O Bus B
ON I Bus Switch Enable
VBIAS I Bias Vo ltage
FUNCTION TABLE (1)
ON B 0 - B9Function
LA
0
- A9Connect
HVBIAS Disconnect
NOTE:
1. H
=
HIGH Vo lta
g
e Level
L
=
LOW Volta
g
e Level
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IDTQS3800
HIGH-SPEED CMOS 10-BIT QUICKSWITCH WITH PRECHARGED OUTPUTS INDUSTRIAL TEMPERATURE RANGE
RON
(ohms)
VIN
(Volts)
TYPICAL ON RESISTANCE vs VIN AT VCC = 5V
16
14
12
10
8
6
4
2
00.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified:
Industrial: TA = -40°C to +85°C, VCC = 5.0V ± 10%
Symbol Parameter Test Conditions Min. Typ.(1) Max. Unit
VIH Input HIGH Voltage Guaranteed Logic HIGH for Control Pins 2 — — V
VIL Input LOW Voltage Guaranteed Logic LOW for Control Pins — — 0.8 V
VBIAS Bias Voltage Vcc = 5V 1.3 — Vcc V
IOBias Current Vcc = 4.5V, VBIAS = 2.4V, VO = 0, ON = HIGH 0.25 — — mA
IIN Input Leakage Current (Control Inputs) 0V ≤ VIN ≤ Vcc ——±1
µA
I
OZ Off-State Current (Hi-Z) 0V ≤ VOUT ≤ Vcc ——±1
µA
R
ON Switch ON Resistance Vcc = Min., VIN = 0V, ION = 30mA —5 7Ω
R
ON Switch ON Resistance Vcc = Min., VIN = 2.4V, ION = 15mA —1015Ω
NOTE:
1. Typical values are at VCC = 5.0V, TA = 25°C.
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INDUSTRIAL TEMPERATURE RANGE
IDTQS3800
HIGH-SPEED CMOS 10-BIT QUICKSWITCH WITH PRECHARGED OUTPUTS
POWER SUPPLY CHARACTERISTICS
Symbol Parameter Test Condit ions(1) Typ. (2) Max. Unit
ICCQ Quiescent Power Supply Current VCC = Max., VIN = GND or Vcc, f = 0 0.2 3 µA
∆ICC Power Supply Current per Control Input HIGH VCC = Max., VIN = 3.4V(3), f = 0 — 2.5 mA
ICCD Dynamic Power Supply Current per MHz(4) VCC = Max., A and B pins open,
Data Inputs = GND
Control Inputs Toggling at 50% Duty Cycle
— 0.25 mA/MHz
NOTES:
1. For conditi ons shown as Min. or M ax., use t he appropri ate values s pec i fied under DC Elect ri cal Characteris tics.
2. Typical values are at VCC = 5.0V, 25°C ambient .
3. Per TLL driven i nput (VIN = 3.4V, c ontrol inputs only). A and B pins do not contribute to ∆Icc.
4. This current applies to the control inputs only and represents the current required to switch int ernal capacitance at the specif ied frequency. The A
and B inputs generate no signifi c ant AC or DC currents as they trans i t i on. This parameter i s guaranteed but not produc t i on tested.
SWITCHING CHARACTERISTICS OVER OPERATING RANGE
TA = -40°C to +85°C, VCC = 5.0V ± 10%
CLOAD = 50pF, RLOAD = 500Ω unless otherwise noted.
Symbol
Parameter Test Conditions Min. (1) Typ. Max. Unit
tPLH
tPHL Data Propagation Delay (1,2)
A to B or B to A —0.25—
ns
tPZL
tPZH Switch Turn-on Delay
ON to A or B VBIAS = 3V,
VBIAS = GND 1.5 — 7.5 ns
tPLZ
tPHZ Switch Turn-off Delay (1)
ON to A or B VBIAS = 3V,
VBIAS = GND 1.5 — 6.5 ns
NOTES:
1. This parameter is guaranteed but not produc tion tested.
2. The bus switc h contributes no propagat i on del ay other than the RC delay of the ON resistance of t he switch and the l oad capacitanc e. The time
const ant for the switch alone is of t he order of 0.25ns for CL = 50pF. Si nce this ti m e constant i s much small er t han the rise and fall t i m es of typi c al
driving s i gnal s, it adds very litt l e propagation delay to t he system. Propagation delay of the bus s wi t ch, when used in a system, is determined by the
driving c i rcuit on the driv i ng side of the swi tch and its i nteraction wit h the load on the driven s i de.
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IDTQS3800
HIGH-SPEED CMOS 10-BIT QUICKSWITCH WITH PRECHARGED OUTPUTS INDUSTRIAL TEMPERATURE RANGE
ORDERING INFORMATION
IDTQS XXXXX XX
Package
Device Type
Blank Industrial (-40°C to +85°C)
Sm all O utline IC (SO24-2)
Qu arter-S ize O utline P ackage (SO24-8)
Thin Shrink Sm all O utline Package (SO24-9)
SO
Q
PA
3800 High Spee d C M OS 10-Bit Q u ickSwitch w ith
Precharged O utputs
X
Process
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