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PI5C3251

8:1 Mux/DeMux BusSwitch

Features:

• Near-Zero propagation delay

• 5Ω switches connect inputs to outputs

• Direct bus connection when switches are ON

•

Ultra Low Quiescent Power (0.2 µA Typical)

– Ideally suited for notebook applications

Description:

Pericom Semiconductor’s PI5C3251 is a Dual 8:1 Multiplexer/

demultiplexer with three-state outputs that is pinout compatible

with the PI74FCT251T, 74F251, and 74ALS/AS/LS 251. Inputs

can be connected to outputs with low on resistance (5Ω) with no

additional ground bounce noise or propagation delay.

• Pin compatible with 74 series 251 logic devices

• Packaging (Pb-free & Green available):

– 16-pin 150-mil wide plastic QSOP (Q)

– 16-pin 300-mil wide plastic SOIC (S)

– 16-pin 150-mil wide plastic SOIC (W)

– 16-pin 173-mil wide plastic TSSOP (L)

Block Diagram

Pin Configuration

VCC

GND

Truth Table

(1)

Select

Hi-Z

Function

Disable

S2-0 = 0

S2-0 = 1

S2-0 = 2

S2-0 = 3

S2-0 = 4

S2-0 = 5

S2-0 = 6

S2-0 = 7

Pin Description

Pin Name

–

GND

Data Inputs

Select Inputs

Enable

Data Outputs

Ground

Power

Description

Note:

H = High Voltage Level, L = Low Voltage Level

PS7016B

09/14/04

PI5C3251

8:1 Mux/DeMux BusSwitch

Maximum Ratings

(Above which the useful life may be impaired. For user guidelines, not tested.)

Storage Temperature .................................................................. –65°C to +150°C

Ambient Temperature with Power Applied ................................. –40°C to +85°C

Supply Voltage to Ground Potential (Inputs & V

Only)........... –0.5V to +7.0V

Supply Voltage to Ground Potential (Outputs & D/O Only) ........ –0.5V to +7.0V

DC Input Voltage .......................................................................... –0.5V to +7.0V

DC Output Current.....................................................................................120 mA

Power Dissipation ..........................................................................................0.5W

Note:

Stresses greater than those listed under 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 specifica-

tion is not implied. Exposure to absolute maximum

rating conditions for extended periods may affect

reliability.

DC Electrical Characteristics

(Over the Operating Range, T

= –40°C to +85°C, V

=5V ±5%)

Parameters

OZH

Description

Input HIGH Voltage

Input LOW Voltage

Input HIGH Current

Input LOW Current

High Impedance Output Current

Clamp Diode Voltage

Short Circuit Current

(3)

Input Hysteresis at Control Pins

Switch On-Resistance

(4)

= Min., V

= 0.0V, I

= 48 mA

= Min., V

= 2.4V, I

= 15 mA

Test Conditions

(1)

Guaranteed Logic HIGH Level

Guaranteed Logic LOW Level

= Max., V

= V

= Max., V

= GND

0 ≤ I, Y ≤ V

= Min., I

= –18 mA

I (Y) = 0V, Y (I) = V

100

150

–0.7

Min.

2.0

–0.5

0.8

±1

–1.2

Ω

µA

Typ

(2)

Max.

Units

Capacitance

= 25°C, f = 1 MHz)

Parameters

(5)

Description

Input Capacitance

- I

Capacitance, Switch Off

Y Capacitance, Switch Off

- I

Capacitance, Switch On

= 0V

Test Conditions

Typ.

Max.

Units

I(OFF)

Y(OFF)

I(ON)

Notes:

1. For Max. or Min. conditions, use appropriate value specified under Electrical Characteristics for the applicable device type.

2. Typical values are at V

= 5.0V,

= 25°C ambient and maximum loading.

3. Not more than one output should be shorted at one time. Duration of the test should not exceed one second.

4. Measured by the voltage drop between I and Y pin at indicated current through the switch. On-Resistance is determined by the lower of the

voltages on the two (I,Y) pins.

5. This parameter is determined by device characterization but is not production tested.

PS7016B

09/14/04

PI5C3251

8:1 Mux/DeMux BusSwitch

Power Supply Characteristics

Parameters

ΔI

Description

Quiescent Power Supply Current

Supply Current per

Input @ TTL HIGH

Supply Current per

Input per MHz

(4)

Max.

= Max.

= Max.,

I and Y Pins Open

= GND

Control Input Toggling

50% Duty Cycle

Test Conditions

(1)

= GND

= 3.4V

(3)

Min. Typ

(2)

0.1

Max. Units

3.0

2.5

µA

CCD

0.25

mA/

MHz

Notes:

1. For Max. or Min. conditions, use appropriate value specified under Electrical Characteristics for the applicable device.

2. Typical values are at Vcc = 5.0V, +25°C ambient.

3. Per TTL driven input (V

= 3.4V,

control inputs only); I and Y pins do not contribute to Icc.

4. This current applies to the control inputs only and represent the current required to switch internal capacitance at the specified frequency. The I

and Y inputs generate no significant AC or DC currents as they transition. This parameter is not tested, but is guaranteed by design.

Switching Characteristics over Operating Range

Parameters

PZH

PZL

PHZ

PLZ

Description

Propagation Delay

(2,3)

In to Y

Bus Select Time

Sn to Y

Bus Enable Time

E to Y

Bus Disable Time

E to Y

= 50

= 500Ω

0.5

Conditions

(1)

Com.

Min.

Max.

0.25

6.6

6.0

Unit

Notes:

1. See test circuit and wave forms.

2. This parameter is guaranteed but not tested on Propagation Delays.

3. The bus switch contributes no propagational 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 constant is much smaller than the rise/fall times of

typical driving signals, it adds very little propagational delay to the system. Propagational 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.

PS7016B

09/14/04

PI5C3251

8:1 Mux/DeMux BusSwitch

Packaging Mechanical: 16-pin QSOP (Q)

.008

0.20

MIN.

.150

.157

3.81

3.99

.008

.013

0.20

0.33

Guage Plane

.010

0.254

.189

.197

4.80

5.00

Detail A

.016

.035

0.41

0.89

.041

1.04

REF

0˚-6˚

.015 x 45°

0.38

.008

0.203

REF

.053

1.35

.069

1.75

Detail A

.007

.010

0.178

0.254

SEATING

PLANE

.004

0.101

.010

0.254

0.41

.016

1.27

.050

.025

BSC

0.635

.008

.012

0.203

0.305

.228

.244

5.79

6.19

X.XX

DENOTES DIMENSIONS IN MILLIMETERS

X.XX

Packaging Mechanical: 16-pin SOIC (S)

.2914

.2992

7.40

7.60

.010

0.254

x 45˚

.029

0.737

.398 10.10

.413 10.50

.020

0.508

.030

0.762

0-8˚

.0926

2.35

.1043

2.64

SEATING

PLANE

.0091

0.23

.0125

0.32

0.41

.016

1.27

.050

.394

.419

10.00

10.65

.050

BSC

1.27

.013

.020

0.33

0.51

.0040

.0118

0.10

0.30

X.XX

DENOTES DIMENSIONS

X.XX

IN MILLIMETERS

PS7016B

09/14/04

PI5C3251

8:1 Mux/DeMux BusSwitch

Packaging Mechanical: 16-pin SOIC (W)

.149

.157

3.78

3.99

.0099

.0196

0.25

x 45˚

0.50

.386

.393

9.80

10.00

.0155

.0260

0.393

0.660

REF

0-8˚

0.41

1.27

.016

.050

.0075

.0098

0.19

0.25

.053

.068

1.35

1.75

SEATING PLANE

.2284

.2440

5.80

6.20

.050

BSC

1.27

.013

.020

0.330

0.508

.0040

0.10

.0098

0.25

X.XX

DENOTES DIMENSIONS

X.XX

IN MILLIMETERS

Packaging Mechanical: 16-pin TSSOP (L)

.169

.177

4.3

4.5

.193

.201

4.9

5.1

.004

.008

.047

max.

1.20

0.09

0.20

0.45

.018

0.75

.030

SEATING

PLANE

.252

BSC

6.4

.0256

BSC

0.65

.007

.012

0.19

0.30

.002

.006

0.05

0.15

X.XX

DENOTES CONTROLLING

X.XX

DIMENSIONS IN MILLIMETERS

PS7016B

09/14/04

参数对比

与PI5C3251W相近的元器件有：PI5C3251、PI5C3251L、PI5C3251Q、PI5C3251QE、PI5C3251S、PI5C3251SE、PI5C3251WE。描述及对比如下：

型号	PI5C3251W	PI5C3251	PI5C3251L	PI5C3251Q	PI5C3251QE	PI5C3251S	PI5C3251SE	PI5C3251WE
描述	CBT/FST/QS/5C/B SERIES, 8-BIT EXCHANGER, TRUE OUTPUT, PDSO16	CBT/FST/QS/5C/B SERIES, 8-BIT EXCHANGER, TRUE OUTPUT, PDSO16	CBT/FST/QS/5C/B SERIES, 8-BIT EXCHANGER, TRUE OUTPUT, PDSO16	CBT/FST/QS/5C/B SERIES, 8-BIT EXCHANGER, TRUE OUTPUT, PDSO16	CBT/FST/QS/5C/B SERIES, 8-BIT EXCHANGER, TRUE OUTPUT, PDSO16	CBT/FST/QS/5C/B SERIES, 8-BIT EXCHANGER, TRUE OUTPUT, PDSO16	CBT/FST/QS/5C/B SERIES, 8-BIT EXCHANGER, TRUE OUTPUT, PDSO16	CBT/FST/QS/5C/B SERIES, 8-BIT EXCHANGER, TRUE OUTPUT, PDSO16
系列	CBT/FST/QS/5C/B	CBT/FST/QS/5C/B	CBT/FST/QS/5C/B	CBT/FST/QS/5C/B	CBT/FST/QS/5C/B	CBT/FST/QS/5C/B	CBT/FST/QS/5C/B	CBT/FST/QS/5C/B
位数	8	8	8	8	8	8	8	8
功能数量	1	1	1	1	1	1	1	1
端子数量	16	16	16	16	16	16	16	16
输出特性	3-STATE	3-ST	3-STATE	3-STATE	3-STATE	3-STATE	3-STATE	3-STATE
输出极性	TRUE	TRUE	TRUE	TRUE	TRUE	TRUE	TRUE	TRUE
表面贴装	YES	Yes	YES	YES	YES	YES	YES	YES
温度等级	INDUSTRIAL	INDUSTRIAL	INDUSTRIAL	INDUSTRIAL	INDUSTRIAL	INDUSTRIAL	INDUSTRIAL	INDUSTRIAL
端子形式	GULL WING	GULL WING	GULL WING	GULL WING	GULL WING	GULL WING	GULL WING	GULL WING
端子位置	DUAL	DUAL	DUAL	DUAL	DUAL	DUAL	DUAL	DUAL
是否Rohs认证	不符合	-	不符合	不符合	符合	不符合	符合	符合
零件包装代码	SOIC	-	TSSOP	SOIC	SOIC	SOIC	SOIC	SOIC
包装说明	SOP, SOP16,.25	-	TSSOP, TSSOP16,.25	SSOP, SSOP16,.25	SSOP, SSOP16,.25	SOP, SOP16,.4	SOP, SOP16,.4	SOP, SOP16,.25
针数	16	-	16	16	16	16	16	16
Reach Compliance Code	compli	-	compli	compliant	compli	compliant	compliant	compli
ECCN代码	EAR99	-	EAR99	EAR99	EAR99	EAR99	EAR99	EAR99
其他特性	TTL COMPATIBLE MUX/DMUX SWITCH; MAX RON = 15 OHM @ VIN 2.4V & ION = 15MA	-	-	TTL COMPATIBLE MUX/DMUX SWITCH; MAX RON = 15 OHM @ VIN 2.4V & ION = 15MA	TTL COMPATIBLE MUX/DMUX SWITCH; MAX RON = 15 OHM @ VIN 2.4V & ION = 15MA	TTL COMPATIBLE MUX/DMUX SWITCH; MAX RON = 15 OHM @ VIN 2.4V & ION = 15MA	TTL COMPATIBLE MUX/DMUX SWITCH; MAX RON = 15 OHM @ VIN 2.4V & ION = 15MA	TTL COMPATIBLE MUX/DMUX SWITCH; MAX RON = 15 OHM @ VIN 2.4V & ION = 15MA
JESD-30 代码	R-PDSO-G16	-	R-PDSO-G16	R-PDSO-G16	R-PDSO-G16	R-PDSO-G16	R-PDSO-G16	R-PDSO-G16
JESD-609代码	e0	-	e0	e0	e3	e0	e3	e3
长度	9.9 mm	-	5 mm	4.9 mm	4.9 mm	10.3 mm	10.3 mm	9.9 mm
负载电容（CL）	50 pF	-	-	50 pF	50 pF	50 pF	50 pF	50 pF
逻辑集成电路类型	BUS EXCHANGER	-	BUS EXCHANGER	BUS EXCHANGER	BUS EXCHANGER	BUS EXCHANGER	BUS EXCHANGER	BUS EXCHANGER
湿度敏感等级	1	-	1	1	1	-	1	1
端口数量	2	-	2	2	2	2	2	2
最高工作温度	85 °C	-	85 °C	85 °C	85 °C	85 °C	85 °C	85 °C
最低工作温度	-40 °C	-	-40 °C	-40 °C	-40 °C	-40 °C	-40 °C	-40 °C
封装主体材料	PLASTIC/EPOXY	-	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY
封装代码	SOP	-	TSSOP	SSOP	SSOP	SOP	SOP	SOP
封装等效代码	SOP16,.25	-	TSSOP16,.25	SSOP16,.25	SSOP16,.25	SOP16,.4	SOP16,.4	SOP16,.25
封装形状	RECTANGULAR	-	RECTANGULAR	RECTANGULAR	RECTANGULAR	RECTANGULAR	RECTANGULAR	RECTANGULAR
封装形式	SMALL OUTLINE	-	SMALL OUTLINE, THIN PROFILE, SHRINK PITCH	SMALL OUTLINE, SHRINK PITCH	SMALL OUTLINE, SHRINK PITCH	SMALL OUTLINE	SMALL OUTLINE	SMALL OUTLINE
峰值回流温度（摄氏度）	240	-	240	240	260	NOT SPECIFIED	260	260
电源	5 V	-	5 V	5 V	5 V	5 V	5 V	5 V
传播延迟（tpd）	0.25 ns	-	0.25 ns	0.25 ns	0.25 ns	0.25 ns	0.25 ns	0.25 ns
认证状态	Not Qualified	-	Not Qualified	Not Qualified	Not Qualified	Not Qualified	Not Qualified	Not Qualified
座面最大高度	1.75 mm	-	1.2 mm	1.75 mm	1.75 mm	2.64 mm	2.64 mm	1.75 mm
最大供电电压 (Vsup)	5.25 V	-	5.25 V	5.25 V	5.25 V	5.25 V	5.25 V	5.25 V
最小供电电压 (Vsup)	4.75 V	-	4.75 V	4.75 V	4.75 V	4.75 V	4.75 V	4.75 V
标称供电电压 (Vsup)	5 V	-	5 V	5 V	5 V	5 V	5 V	5 V
技术	CMOS	-	-	CMOS	CMOS	CMOS	CMOS	CMOS
端子面层	Tin/Lead (Sn/Pb)	-	Tin/Lead (Sn/Pb)	Tin/Lead (Sn/Pb)	MATTE TIN (787)	Tin/Lead (Sn/Pb)	MATTE TIN	MATTE TIN (787)
端子节距	1.27 mm	-	0.65 mm	0.635 mm	0.635 mm	1.27 mm	1.27 mm	1.27 mm
处于峰值回流温度下的最长时间	30	-	30	30	40	NOT SPECIFIED	40	40
宽度	3.885 mm	-	4.4 mm	3.9 mm	3.9 mm	7.5 mm	7.5 mm	3.885 mm
Base Number Matches	1	-	-	1	-	1	1	1
厂商名称	-	-	Pericom Semiconductor Corporation (Diodes Incorporated)	Pericom Semiconductor Corporation (Diodes Incorporated)	Pericom Semiconductor Corporation (Diodes Incorporated)	Pericom Semiconductor Corporation (Diodes Incorporated)	Pericom Semiconductor Corporation (Diodes Incorporated)	-