Document
4 Channel 2:1 Switch BL3257
BL3257
Description
BL3257 is a quad single pole/double throw high-speed CMOS TTL-compatible bus switch. The low on resistance of the switch allows inputs to be connected to outputs without adding propagation delay or generating additional ground bounce noise. Also this device has exceptionally high current capability, which is far greater than most analog switches offered today. A single 5V supply is all that is required for operation.
Applications
• Set Top Boxes • Flat Panel Displays • CRT Displays • DVD-RW
Features
1、VCC:4.0V-5.5V 2、Low On-Resistance: 5Ω 3、Fast switching: 10.0ns (VDD=5V) 4、Low crosstalk: -70dB (VDD = 5V) 6、Packaging(Pb-free & Green Available):
SOP-16 、SSOP-16 6、ESD:>4000V HBM
Pin Configuration
IN S1A S2A DA S1B S2B DB GND
Block Diagram
VDD EN S1D S2D DD S1C S2C DC
S1A 2 S2A 3 S1B 5 S2B 6
S1C 11 S2C 10 S1D 14 S2D 13
DECODER/ DRIVERS
1 15 IN EN
4 DA 7 DB 9 DC 12 DD
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Order Information
Part Number BL3257SO BL3257SS
Pin Description
BL3257
Package SOP16 SSOP16
shipping Tube
5000 pcs / Tape & Reel
Pin Name VDD GND
DA, DB, DC, DD
S1A, S1B, S1C, S1D
S2A, S2B, S2C, S2D IN ENN
Description Power Ground
Analog Video I/O Analog Video 1 I/O
Analog Video 2 I/O Select Input Enable
Function Table
ENN
S
ON SWITCH
0 1 S2 (S2A, S2B, S2C, S2D)
0 0 S1 (S1A, S1B, S1C, S1D)
1X
Disabled
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BL3257
ELECTRICAL CHARACTERISTICS
1 ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Units
VDD Supply Voltage
-0.5 to +6.0 V
VIS Analog Input Voltage (VS1, VS2, or VD)
-0.5 to +6.0 V
VS VENN Digital Select Input Voltage
-0.5 to +6.0 V
lanll Continuous DC Current from D to S1/S2
±200
mA
Maximum ratings are those values beyond which device damage can occur. If these limits are exceeded, device
functional operation is not implied, damage may occur and reliability may be affected.
2 RECOMMENDED OPERATING CONDITIONS
Symbol
Parameter
VDD Supply Voltage VIS Analog Input Voltage (VS1, VS2, or VD) VS VENN Digital Select Input Voltage TA Operating Temperature
MIN
MAX Units
4.0 5.5 V
0 2V
0
VDD
V
-40 85 ℃
3 ELECTRICAL CHARACTERISTICS
Parameter
Symbol
Test Conditions
Min Typ Max Units
DC ELECTRICAL CHARACTERISTICS
Switch On Resistance
VDD = 4.5V, VIS = 1.0V, RL = 75Ω,
IIS = 13mA RON VDD = 4.5V, VIS = 2.0V, RL = 75Ω,
IIS = 26mA
5 7Ω 7.5 10 Ω
HIGH Level Input Voltage
VIH Guaranteed Logic HIGH Level 2.0
V
LOW Level Input Voltage
VIL Guaranteed Logic LOW Level -0.5
0.8 V
Input high current IIH
VDD = 5.5V, VIN = VDD
±1 μA
Input low current IIL
VDD = S.5V, VIN = GND
±1 μA
Switch output leakage current
Io
0 ≤ S1, S2, or D ≤ VDD, Switch OFF
Switch short circuit current
Ios
Clamping diode voltage
VIK
VDD = 4.5V, IIN= -18mA
±1 μA 230 mA -0.9 V
Input hysteresis
VH
200 mV
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BL3257
AC ELECTRICAL CHARACTERISTICS
Turn on time
Turn off time
Cross talk
Enable input capacitance Off state input capacitance On state input capacitance
TON TOFF XTALK
CIN COFF CON
RL = 70Ω, CL = 20pF RL = 70Ω, CL = 20pF RIN = 10Ω, RL = 150Ω, f =
10MHz VIN = 0V, f = 1MHz
VIN = 0V, f = 1MHz
VIN = 0V, f = 1MHz
POWER SUPPLY CHARACTERISTICS
Quiescent supply current Supply current change when changing input
Supply current when toggle input
IDD Δ IDD
IDDD
VDD = +5.5V, IN = GND or 5V
VDD = +5.5V, IN = 3.4V VDD = +5.5V, S1, S2 and D Pins
Open ENN = GND Control Input Toggling 50% Duty
Cycle
8 15 ns 4 8 ns -70 dB 5 pF 10 pF 15 pF
0.1 10.0 μA
300 μA mA/
0.1 MHz
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TEST SETUP CIRCUITS
BL3257
Figure1. Test Circuit for On Resistance
Figure2. Test Circuit for Bandwidth
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PACKAGE OUTLINE DIMENSIONS
SOP16
BL3257
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SSOP16
BL3257
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