Revised April 1999 74VHC157 Quad 2-Input Multiplexer General Description The VHC157 is an advanced high speed CMOS Quad 2Channel Multiplexer fabricated with silicon gate CMOS technology. It achieves the high speed operation similar to equivalent Bipolar Schottky TTL while maintaining the CMOS low power dissipation. It consists of four 2-input digital multiplexers with common select and enable inputs. When the ENABLE input is held “H” level, selection of data is inhibited and all the outputs become “L” level. The SELECT decoding determines whether the I0x or I1x inputs get routed to their corresponding outputs. An Input protection circuit ensures that 0V to 7V can be applied to the input pins without regard to the supply volt- age. This device can be used to interface 5V to 3V systems and on two supply systems such as battery back up. This circuit prevents device destruction due to mismatched supply and input voltages. Features ■ High Speed: tPD = 4.1 ns (typ) at VCC = 5V ■ Low power dissipation: ICC = 4 µA (max.) at TA = 25°C ■ High noise immunity: VNIH = VNIL = 28% VCC (min.) ■ Power down protection is provided on all inputs ■ Low noise: VOLP = 0.8V (max.) ■ Pin and function compatible with 74HC157 Ordering Code: Order Number 74VHC157M 74VHC157SJ 74VHC157MTC Package Number M16A M16D MTC16 74VHC157N N16E Package Description 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150” Narrow 16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide 16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300” Wide Surface mount packages are also available on Tape and Reel. Specify by appending the suffix letter “X” to the ordering code. Logic Symbols Connection Diagram IEEE/IEC Pin Descriptions Pin Names © 1999 Fairchild Semiconductor Corporation DS011536.prf Description I0a–I0d Source 0 Data Inputs I1a–I1d Source 1 Data Inputs E Enable Input S Select Input Za–Zd Outputs www.fairchildsemi.com 74VHC157 Quad 2-Input Multiplexer November 1992 74VHC157 Truth Table Functional Description Inputs S I0 I1 Z H X X X L L H X L L L H X H H L L L X L L L H X H E The VHC157 is a quad 2-input multiplexer. It selects four bits of data from two sources under the control of a common Select input (S). The Enable input (E) is active-LOW. When E is HIGH, all of the outputs (Z) are forced LOW regardless of all other inputs. The VHC157 is the logic implementation of a 4-pole, 2-position switch where the position of the switch is determined by the logic levels supplied to the Select input. The logic equations for the outputs are shown below: Outputs Za = E • (I1a • S + I0a • S) Zb = E • (I1b • S + I0b • S) H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial Zc = E • (I1c • S + I0c • S) Zd = E • (I1d • S + I0d • S) A common use of the VHC157 is the moving of data from two groups of registers to four common output busses. The particular register from which the data comes is determined by the state of the Select input. A less obvious use is as a function generator. The VHC157 can generate any four of the sixteen different functions of two variables with one variable common. This is useful for implementing gating functions. Logic Diagram Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays. www.fairchildsemi.com 2 Supply Voltage (VCC) −0.5V to +7.0V DC Input Voltage (VIN) −0.5V to +7.0V Recommended Operating Conditions (Note 2) 2.0V to +5.5V Supply Voltage (VCC) −0.5V to VCC + 0.5V DC Output Voltage (VOUT) 0V to +5.5V Input Voltage (VIN) Input Diode Current (IIK) −20 mA Output Voltage (VOUT) Output Diode Current (IOK) ±20 mA Operating Temperature (TOPR) DC Output Current (IOUT) ±25 mA Input Rise and Fall Time (tr, tf) DC VCC /GND Current (ICC ) ±50 mA VCC = 3.3V ± 0.3V 0 ∼ 100 ns/V −65°C to +150°C VCC = 5.0V ± 0.5V 0 ∼ 20 ns/V Storage Temperature (TSTG) Lead Temperature (TL) (Soldering, 10 seconds) 0V to VCC −40°C to +85°C Note 1: Absolute Maximum Ratings are values beyond which the device may be damaged or have its useful life impaired. The databook specifications should be met, without exception, to ensure that the system design is reliable over its power supply, temperature, and output/input loading variables. Fairchild does not recommend operation outside databook specifications. 260°C Note 2: Unused inputs must be held HIGH or LOW. They may not float. DC Electrical Characteristics Symbol VIH HIGH Level Input Voltage VIL VOL TA = 25°C Min TA = −40°C to +85°C Typ Max Min 2.0 1.50 1.50 3.0 − 5.5 0.7 VCC 0.7 VCC LOW Level Input Voltage VOH VCC (V) Parameter Max 2.0 0.50 0.50 0.3 VCC 0.3 VCC 2.0 1.9 2.0 1.9 Output Voltage 3.0 2.9 3.0 2.9 4.5 4.4 4.5 4.4 3.0 2.58 2.48 4.5 3.94 3.80 VIN = VIH IOH = −50 µA Output Voltage 3.0 0.0 0.1 0.1 4.5 0.0 0.1 0.1 Input Leakage Current Quiescent Supply Current or VIL IOH = −4 mA V 2.0 ICC V V LOW Level IIN 0.0 Conditions V 3.0 − 5.5 HIGH Level Units 0.1 IOH = −8 mA VIN = VIH IOL = 50 µA 0.1 V or VIL IOL = 4 mA 3.0 0.36 0.44 4.5 0.36 0.44 0 − 5.5 ±0.1 ±1.0 µA VIN = 5.5V or GND 5.5 4.0 40.0 µA VIN = VCC or GND V IOL = 8 mA Noise Characteristics Symbol Parameter VOLP Quiet Output Maximum (Note 3) Dynamic VOL VOLV Quiet Output Minimum (Note 3) Dynamic VOL VIHD Minimum HIGH Level (Note 3) Dynamic Input Voltage VILD Maximum LOW Level (Note 3) Dynamic Input Voltage TA = 25°C VCC (V) Typ Limits 5.0 0.3 0.8 V CL = 50 pF 5.0 −0.3 −0.8 V CL = 50 pF 5.0 3.5 V CL = 50 pF 5.0 1.5 V CL = 50 pF Units Conditions Note 3: Parameter guaranteed by design. 3 www.fairchildsemi.com 74VHC157 Absolute Maximum Ratings(Note 1) 74VHC157 AC Electrical Characteristics Symbol Parameter tPLH Propagation Delay tPHL In to Zn VCC (V) 3.3 ± 0.3 5.0 ± 0.5 tPLH Propagation Delay tPHL S to Zn 3.3 ± 0.3 5.0 ± 0.5 tPLH Propagation Delay tPHL E to Zn 3.3 ± 0.3 5.0 ± 0.5 TA = 25°C Min TA = −40°C to +85°C Typ Max Min Max 6.2 9.7 1.0 11.5 8.7 13.2 1.0 15.0 4.1 6.4 1.0 7.5 5.6 8.4 1.0 9.5 8.4 13.2 1.0 15.5 10.9 16.7 1.0 19.0 5.3 8.1 1.0 9.5 6.8 10.1 1.0 11.5 8.7 13.6 1.0 16.0 11.2 17.1 1.0 19.5 5.6 8.6 1.0 10.0 7.1 10.6 1.0 12.0 10 CIN Input Capacitance 4 CPD Power Dissipation 20 10 Units ns ns ns ns ns ns Conditions CL = 15 pF CL = 50 pF CL = 15 pF CL = 50 pF CL = 15 pF CL = 50 pF CL = 15 pF CL = 50 pF CL = 15 pF CL = 50 pF CL = 15 pF CL = 50 pF pF VCC = Open pF (Note 4) Capacitance Note 4: CPD is defined as the value of the internal equivalent capacitance which is calculated from the operating current consumption without load. Average operating current can be obtained by the equation: ICC (opr.) = CPD * VCC * fIN + ICC. www.fairchildsemi.com 4 74VHC157 Physical Dimensions inches (millimeters) unless otherwise noted 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150” Narrow Package Number M16A 16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide Package Number M16D 5 www.fairchildsemi.com 74VHC157 Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide Package Number MTC16 www.fairchildsemi.com 6 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300” Wide Package Number N16E LIFE SUPPORT POLICY FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein: 2. A critical component in any component of a life support 1. Life support devices or systems are devices or systems device or system whose failure to perform can be reawhich, (a) are intended for surgical implant into the sonably expected to cause the failure of the life support body, or (b) support or sustain life, and (c) whose failure device or system, or to affect its safety or effectiveness. to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the www.fairchildsemi.com user. Fairchild does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and Fairchild reserves the right at any time without notice to change said circuitry and specifications. 74VHC157 Quad 2-Input Multiplexer Physical Dimensions inches (millimeters) unless otherwise noted (Continued)