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74FST6800QG

P1-P3P4-P5
1
INDUSTRIAL TEMPERATURE RANGE
IDT74FST6800
10-BIT BUS SWITCH WITH PRECHARGED OUTPUTS
APRIL 2015INDUSTRIAL TEMPERATURE RANGE
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
© 2015 Integrated Device Technology, Inc. DSC-5519/5
FEATURES:
• Bus switches provide zero delay paths
• Low switch on-resistance: 7
ΩΩ
ΩΩ
Ω
• TTL-compatible input and output levels
• ESD > 2000V per MIL-STD-883, Method 3015; > 200V using
machine model (C = 200pF, R = 0)
• Available in QSOP and TSSOP packages
FUNCTIONAL BLOCK DIAGRAM
QSOP / TSSOP
TOP VIEW
PIN CONFIGURATION
IDT74FST6800
10-BIT BUS SWITCH
WITH PRECHARGED
OUTPUTS
DESCRIPTION:
The FST6800 belongs to IDT's family of Bus switches. Bus switch devices
perform the function of connecting or isolating two ports without providing
any inherent current sink or source capability. Thus they generate little or
no noise of their own while providing a low resistance path for an external
driver. These devices connect input and output ports through an n-channel
FET. When the gate-to-source junction of this FET is adequately forward-
biased the device conducts and the resistance between input and output
ports is small. Without adequate bias on the gate-to-source junction of the
FET, the FET is turned off, therefore with no VCC applied, the device has
hot insertion capability.
The low on-resistance and simplicity of the connection between input and
output ports reduces the delay in this path to close to zero.
The FST6800 provides a 10-Bit TTL-compatible interface. The ON pin
serves as the enable pin. When ON is high, A and B ports are isolated and
B outputs are precharged to the BIASV voltage, through the equivalent of
a 10KΩ resistor.
A1
A10 B10
B1
BIASV
ON
A1
A3
A4
A6
A9
A2
A5
A7
A8
A10
GND
V
CC
B1
B2
B3
B4
B5
B6
B8
B9
B10
BIASV
B
7
15
13
14
24
23
17
18
19
20
21
22
16
1
2
3
4
5
6
7
8
9
10
12
11
ON
2
INDUSTRIAL TEMPERATURE RANGE
IDT74FST6800
10-BIT BUS SWITCH WITH PRECHARGED OUTPUTS
Symbol Description Max Unit
VTERM
(2)
Terminal Voltage with Respect to GND –0.5 to +7 V
TSTG Storage Temperature –65 to +150 °C
I
OUT Maximum Continuous Channel Current 128 mA
ABSOLUTE MAXIMUM RATINGS
(1)
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 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.
2. Vcc, Control, and Switch terminals.
Symbol Parameter Conditions
(2)
Typ. Unit
CIN Control Input Capacitance 4 pF
C
I/O Switch Input/Output Capacitance Switch Off pF
CAPACITANCE
(1)
NOTES:
1. Capacitance is characterized but not tested.
2. TA = 25°C, f = 1MHz, VIN = 0V, VOUT = 0V.
Pin Names I/O Description
A1-10, B1-10 I/O Buses A, B
ON I Bus Switch Enable (Active LOW)
BIASV I BIAS Voltage
PIN DESCRIPTION
NOTE:
1. H = HIGH Voltage Level
L = LOW Voltage Level
FUNCTION TABLE
(1)
ON B1-10 Description
LA1-10 Connect
H BIASV Precharge
Symbol Parameter Test Conditions
(1)
Min. Typ.
(2)
Max. Unit
VIH Input HIGH Voltage Guaranteed Logic HIGH for Control Inputs 2 — — V
VIL Input LOW Voltage Guaranteed Logic LOW for Control Inputs — — 0.8 V
IIH Input HIGH Current VCC = Max. VI = VCC —— ±1 μA
IIL Input LOW Current VI = GND — — ±1
IO Precharge Output Current VCC = Min., BIASV = 2.4V, VO = 0V 0.15 — — mA
IOZH High Impedance Output Current VCC = Max. VO = VCC —— ±1 μA
IOZL (3-State Output Pins) VO = GND — — ±1
IOS Short Circuit Current VCC = Min., VO = GND
(3)
— 300 — mA
VIK Clamp Diode Voltage VCC = Min., IIN = –18mA — –0.7 –1.2 V
R
ON Switch On Resistance
(4)
VCC = 4.75V, VIN = 0.0V ION = 64mA — — 7 Ω
VCC = 4.75V, VIN = 2.4V ION = 15mA — — 15
IOFF Input/Output Power Off Leakage VCC = 0V, VIN or VO ≤ 4.5V — — 1 μA
I
CC Quiescent Power Supply Current VCC = Max., VI = GND or VCC — 0.1 3 μA
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified:
Industrial: TA = –40°C to +85°C, VCC = 5.0V ± 5%, BIASV = 0 to VCC
NOTES:
1. For conditions shown as Max. or Min., use appropriate value specified under Electrical Characteristics for the applicable device type.
2. Typical values are at VCC = 5.0V, +25°C ambient.
3. Not more than one output should be tested at one time. Duration of the test should not exceed one second.
4. Measured by voltage drop between ports at indicated current through the switch.
3
INDUSTRIAL TEMPERATURE RANGE
IDT74FST6800
10-BIT BUS SWITCH WITH PRECHARGED OUTPUTS
Symbol Parameter Test Conditions
(1)
Min. Typ.
(2)
Max. Unit
ΔI
CC Quiescent Power Supply Current VCC = Max. — 0.5 1.5 mA
TTL Inputs HIGH VIN = 3.4V
(3)
ICCD Dynamic Power Supply VCC = Max., Outputs Open VIN = VCC —3040μA/
Current
(4)
Enable Pin Toggling VIN = GND MHz/
50% Duty Cycle Enable
IC Total Power Supply Current
(6)
VCC = Max., Outputs Open VIN = VCC —34mA
Enable Pin Toggling VIN = GND
(Ten Switches Toggling)
f
i = 10MHz VIN = 3.4V — 3.3 4.8
50% Duty Cycle VIN = GND
POWER SUPPLY CHARACTERISTICS
NOTES:
1. For conditions shown as Max. or Min., use appropriate value specified under Electrical Characteristics for the applicable device type.
2. Typical values are at V
CC = 5.0V, +25°C ambient.
3. Per TTL driven input (V
IN = 3.4V). All other inputs at VCC or GND.
4. This parameter is not directly testable, but is derived for use in Total Power Supply Calculations.
5. Values for these conditions are examples of Icc formula. These limits are guaranteed but not tested.
6. I
C = IQUIESCENT + IINPUTS + IDYNAMIC
IC = ICC + ΔICC DHNT + ICCD (fiN)
ICC = Quiescent Current
ΔICC = 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 Input Transition Pair (HLH or LHL)
fCP = Clock Frequency for Register Devices (zero for non-register devices)
fi = Input Frequency
N = Number of SwitchesToggling at fi
All currents are in milliamps and all frequencies are in megahertz
SWITCHING CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified:
Industrial: TA = -40°C to +85°C, VCC = 5.0V ± 5%
Symbol Description Condition
(1)
Min.
(2)
Typ. Max. Unit
t
PLH Data Propagation Delay CL = 50pF — — 0.25 ns
tPHL Ax, Bx to Bx, Ax
(3,4)
RL = 500Ω
t
PZH Switch Turn On Delay 1.5 — 6.5 ns
tPZL ON to Ax, Bx
t
PHZ Switch Turn Off Delay 1.5 — 5.5 ns
tPLZ ON to Ax, Bx
(3)
NOTES:
1. See test circuit and waveforms.
2. Minimum limits guaranteed but not tested.
3. This parameter is guaranteed by design but not tested.
4. The bus switch contributes no propagation delay other than the RC delay of the on resistance of the switch and the load capacitance. The time constant for the switch alone
is of the order of 0.25 ns for 50 pF load. Since this time is constant and much smaller than the rise/fall times of typical driving signals, it adds very little propagation delay to the
system. Propagation delay of the bus switch when used in a system is determined by the driving circuit on the driving side of the switch and its interaction with the load on
the driven side.
P1-P3P4-P5

74FST6800QG

Mfr. #:
Buy 74FST6800QG
Manufacturer:
IDT
Description:
Digital Bus Switch ICs 10BIT 2 PORT BUS SWITCH
Lifecycle:
New from this manufacturer.
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