Revised December 2000 74VCX162839 Low Voltage 20-Bit Selectable Register/Buffer with 3.6V Tolerant Inputs/Outputs and 26Ω Series Resistors in the Outputs General Description Features The VCX162839 contains twenty non-inverting selectable buffered or registered paths. The device can be configured to operate in a registered, or flow through buffer mode by utilizing the register enable (REGE) and Clock (CLK) signals. The device operates in a 20-bit word wide mode. All outputs can be placed into 3-STATE through use of the OE pin. These devices are ideally suited for buffered or registered 168 pin and 200 pin SDRAM DIMM memory modules. ■ Compatible with PC100 and PC133 DIMM module specifications The 74VCX162839 is designed for low voltage (1.65V to 3.6V) VCC applications with I/O compatibility up to 3.6V. The 74VCX162839 is also designed with 26Ω series resistors in the outputs. This design reduces line noise in applications such as memory address drivers, clock drivers, and bus transceivers/transmitters. ■ 1.65V–3.6V VCC supply operation ■ 3.6V tolerant inputs and outputs ■ 26Ω series resistors in the outputs ■ tPD (CLK to O n) 4.1 ns max for 3.0V to 3.6V VCC 5.8 ns max for 2.3V to 2.7V VCC 9.8 ns max for 1.65V to 1.95V VCC ■ Power-off high impedance inputs and outputs ■ Supports live insertion and withdrawal (Note 1) ■ Static Drive (IOH/IOL) ±12 mA @ 3.0V VCC The 74VCX162839 is fabricated with an advanced CMOS technology to achieve high speed operation while maintaining low CMOS power dissipation. ±8 mA @ 2.3V VCC ±3 mA @ 1.65V VCC ■ Uses patented noise/EMI reduction circuitry ■ Latch-up performance exceeds 300 mA ■ ESD performance: Human body model > 2000V Machine model > 200V Note 1: To ensure the high-impedance state during power up or power down, OE should be tied to VCC through a pull-up resistor; the minimum value of the resistor is determined by the current-sourcing capability of the driver. Ordering Code: Order Number Package Number Package Description 74VCX162839MTD MTD56 56-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 6.1mm Wide Devices also available in Tape and Reel. Specify by appending suffix letter “X” to the ordering code. Logic Symbol Pin Descriptions Pin Names © 2000 Fairchild Semiconductor Corporation DS500127 Description OE Output Enable Input (Active LOW) I0–I19 Inputs O0–O19 Outputs CLK Clock Input REGE Register Enable Input www.fairchildsemi.com 74VCX162839 Low Voltage 20-Bit Selectable Register/Buffer with 3.6V Tolerant Inputs/Outputs and 26Ω Series Resistors in the Outputs March 1998 74VCX162839 Connection Diagram Truth Table Inputs Outputs CLK REGE In OE On ↑ H H L H ↑ H L L L X L H L H X L L L L X X X H Z H = Logic HIGH L = Logic LOW X = Don’t Care, but not floating Z = High Impedance ↑ = LOW-to-HIGH Clock Transition Functional Description The 74VCX162839 consists of twenty selectable noninverting buffers or registers with word wide modes. Mode functionality is selected through operation of the CLK and REGE pin as shown by the truth table. When REGE is held at a logic HIGH the device operates as a 20-bit register. Data is transferred from In to On on the rising edge of the CLK input. When the REGE pin is held at a logic LOW the device operates in a flow through mode and data propagates directly from the In to the On outputs. All outputs can be 3-stated by holding the OE pin at a logic HIGH. Logic Diagram www.fairchildsemi.com 2 Supply Voltage (VCC) −0.5V to +4.6V DC Input Voltage (VI) −0.5V to +4.6V Recommended Operating Conditions (Note 4) Power Supply Output Voltage (VO) Operating −0.5V to +4.6V Outputs 3-STATE Outputs Active (Note 3) DC Input Diode Current (IIK) VI < 0V 1.65V to 3.6V Data Retention Only −0.5V to VCC + 0.5V 1.2V to 3.6V −0.3V to +3.6V Input Voltage −50 mA Output Voltage (VO) DC Output Diode Current (IOK) Output in Active States 0V to VCC VO < 0V −50 mA Output in “OFF” State 0V to 3.6V VO > VCC +50 mA Output Current in IOH/IOL DC Output Source/Sink Current ±50 mA (IOH/IOL) Storage Temperature Range (TSTG) ±12 mA VCC = 2.3V to 2.7V ±8 mA VCC = 1.65V to 2.3V DC VCC or GND Current per Supply Pin (ICC or GND) VCC = 3.0V to 3.6V ±100 mA ±3 mA Free Air Operating Temperature (TA) −65°C to +150°C −40°C to +85°C Minimum Input Edge Rate (∆t/∆V) VIN = 0.8V to 2.0V, VCC = 3.0V 10 ns/V Note 2: The Absolute Maximum Ratings are those values beyond which the safety of the device cannot be guaranteed. The device should not be operated at these limits. The parametric values defined in the Electrical Characteristics tables are not guaranteed at the Absolute Maximum Ratings. The “Recommended Operating Conditions” table will define the conditions for actual device operation. Note 3: IO Absolute Maximum Rating must be observed. Note 4: Floating or unused inputs must be held HIGH or LOW. DC Electrical Characteristics (2.7V < VCC ≤ 3.6V) Symbol Parameter Conditions VCC (V) Min 2.0 VIH HIGH Level Input Voltage 2.7 − 3.6 VIL LOW Level Input Voltage 2.7 − 3.6 VOH HIGH Level Output Voltage VOL LOW Level Output Voltage IOH = −100 µA Max V 0.8 2.7 − 3.6 VCC − 0.2 IOH = −6 mA 2.7 2.2 IOH = −8 mA 3.0 2.4 IOH = −12 mA 3.0 2.2 IOL = 100 µA 2.7 − 3.6 0.2 IOL = 6 mA 2.7 0.4 IOL = 8 mA 3.0 0.55 IOL = 12 mA II Input Leakage Current 0V ≤ VI ≤ 3.6V IOZ 3-STATE Output Leakage 0V ≤ VO ≤ 3.6V VI = V IH or VIL IOFF Power-OFF Leakage Current 0V ≤ (VI, VO) ≤ 3.6V ICC Quiescent Supply Current VI = V CC or GND ∆ICC Increase in ICC per Input VCC ≤ (VI, VO) ≤ 3.6V (Note 5) VIH = VCC −0.6V Units V V V 3.0 0.8 2.7 − 3.6 ±5.0 µA 2.7 − 3.6 ±10 µA 0 10 µA 2.7 − 3.6 2.7 − 3.6 20 ±20 750 µA µA Note 5: Outputs disabled or 3-STATE only. 3 www.fairchildsemi.com 74VCX162839 Absolute Maximum Ratings(Note 2) 74VCX162839 DC Electrical Characteristics (2.3V ≤ VCC ≤ 2.7V) Symbol Parameter Conditions VCC (V) Min 1.6 VIH HIGH Level Input Voltage 2.3 − 2.7 VIL LOW Level Input Voltage 2.3 − 2.7 VOH HIGH Level Output Voltage VOL LOW Level Output Voltage IOH = −100 µA Max Units 0.7 V V 2.3 − 2.7 VCC − 0.2 IOH = −4 mA 2.3 2.0 IOH = −6 mA 2.3 1.8 IOH = −8 mA 2.3 1.7 IOL = 100 µA 2.3 − 2.7 0.2 IOL = 6 mA 2.3 0.4 IOL = 8 mA 2.3 0.6 2.3 − 2.7 ±5.0 µA 2.3–2.7 ±10 µA 0 10 µA II Input Leakage Current 0V ≤ VI ≤ 3.6V IOZ 3-STATE Output Leakage 0V ≤ VO ≤ 3.6V VI = VIH or VIL IOFF Power-OFF Leakage Current 0V ≤ (VI, VO) ≤ 3.6V ICC Quiescent Supply Current VI = VCC or GND VCC ≤ (VI, VO) ≤ 3.6V (Note 6) V 20 2.3 − 2.7 ±20 V µA Note 6: Outputs disabled or 3-STATE only. DC Electrical Characteristics (1.65V ≤ VCC < 2.3V) Symbol Parameter VIH HIGH Level Input Voltage Conditions 1.65 - 2.3 VIL LOW Level Input Voltage VOH HIGH Level Output Voltage IOH = −100 µA VOL LOW Level Output Voltage Min Max Units 0.65 x VCC 0.35 × VCC 1.65 - 2.3 V 1.65 - 2.3 VCC − 0.2 IOH = −3 mA 1.65 1.25 IOL = 100 µA 1.65 - 2.3 0.2 1.65 0.3 1.65 - 2.3 ±5.0 µA 1.65 - 2.3 ±10 µA 0 10 µA IOL = 3 mA II Input Leakage Current 0V ≤ VI ≤ 3.6V IOZ 3-STATE Output Leakage 0V ≤ VO ≤ 3.6V VI = VIH or VIL IOFF Power-OFF Leakage Current 0V ≤ (VI, VO) ≤ 3.6V ICC Quiescent Supply Current VI = VCC or GND VCC ≤ (VI, VO) ≤ 3.6V (Note 7) Note 7: Outputs disabled or 3-STATE only. www.fairchildsemi.com VCC (V) 4 1.65 - 2.3 V 20 ±20 V µA (Note 8) TA = −40°C to +85°C, CL = 30 pF, RL = 500Ω Symbol VCC = 3.3V ± 0.3V Parameter Min fMAX Maximum Clock Frequency tPHL Propagation Delay In to On tPLH (REGE = 0) tPHL Propagation Delay CLK to On tPLH (REGE = 1) tPHL, tPLH Propagation Delay REGE to On tPZL, tPZH VCC = 2.5V ± 0.2V Max Min 250 Max 200 VCC = 1.8V ± 0.15V Min Units Max 125 MHz 0.8 3.5 1.0 4.9 1.5 9.8 ns 0.8 4.1 1.0 5.8 1.5 9.8 ns 0.8 4.9 1.0 6.4 1.5 9.8 ns Output Enable Time 0.8 4.3 1.0 6.1 1.5 9.8 ns tPLZ, tPHZ Output Disable Time 0.8 4.3 1.0 4.9 1.5 8.8 ns tS Setup Time 1.0 1.0 2.5 tH Hold Time 0.7 0.7 1.0 ns tW Pulse Width 1.5 1.5 4.0 ns tosHL Output to Output Skew tosLH (Note 9) 0.5 ns 0.5 0.75 ns Note 8: For CL = 50 pF, add approximately 300 ps to the AC maximum specification. Note 9: Skew is defined as the absolute value of the difference between the actual propagation delay for any two separate outputs of the same device. The specification applies to any outputs switching in the same direction, either HIGH-to-LOW (tOSHL) or LOW-to-HIGH (tOSLH). Extended AC Electrical Characteristics (Note 10) TA = −0°C to +85°C, RL = 500Ω VCC = 3.3V ± 0.3V Symbol CL = 50 pF Parameter Min Units Max tPHL, tPLH Propagation Delay In to On (REGE = 0) 1.0 3.8 ns tPHL, tPLH Propagation Delay CLK to On (REGE = 1) 1.4 4.4 ns tPHL, tPLH Propagation Delay REGE to On 1.0 5.2 ns tPZL, tPZH Output Enable Time 1.0 4.6 ns tPLZ, tPHZ Output Disable Time 1.0 4.6 ns tS Setup Time 1.0 ns tH Hold Time 0.7 ns Note 10: This parameter is guaranteed by characterization but not tested. Dynamic Switching Characteristics Symbol VOLP VOLV VOHV Parameter Quiet Output Dynamic Peak VOL Quiet Output Dynamic Valley VOL Quiet Output Dynamic Valley VOH Conditions CL = 30 pF, VIH = VCC, VIL = 0V CL = 30 pF, VIH = VCC, VIL = 0V CL = 30 pF, VIH = VCC, VIL = 0V VCC (V) TA = +25°C Typical 1.8 0.15 2.5 0.25 3.3 0.35 1.8 −0.15 2.5 −0.25 3.3 −0.35 1.8 1.55 2.5 2.05 3.3 2.65 Units V V V Capacitance Symbol Parameter Conditions TA = +25°C Typical Units CIN Input Capacitance VCC = 1.8V, 2.5V or 3.3V, VI = 0V or VCC 6 pF COUT Output Capacitance VI = 0V or VCC, VCC = 1.8V, 2.5V or 3.3V 7 pF CPD Power Dissipation Capacitance 20 pF VI = 0V or VCC, f = 10 MHz, VCC = 1.8V, 2.5V or 3.3V 5 www.fairchildsemi.com 74VCX162839 AC Electrical Characteristics 74VCX162839 AC Loading and Waveforms TEST SWITCH tPLH, tPHL Open tPZL, tPLZ 6V at VCC = 3.3 ± 0.3V; VCC x 2 at VCC = 2.5 ± 0.2V; 1.8V ± 0.15V tPZH, tPHZ GND FIGURE 1. AC Test Circuit FIGURE 3. 3-STATE Output High Enable and Disable Times for Low Voltage Logic FIGURE 2. Waveform for Inverting and Non-Inverting Functions FIGURE 4. 3-STATE Output Low Enable and Disable Times for Low Voltage Logic FIGURE 6. Setup Time, Hold Time and Recovery Time for Low Voltage Logic FIGURE 5. Propagation Delay, Pulse Width and trec Waveforms Symbol VCC 3.3V ± 0.3V 2.5V ± 0.2V 1.8V ± 0.15V Vmi 1.5V VCC/2 VCC/2 Vmo 1.5V VCC/2 VCC/2 VX VOL + 0.3V VOL + 0.15V VOL + 0.15V VY VOH − 0.3V VOH − 0.15V VOH − 0.15V www.fairchildsemi.com 6 56-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 6.1mm Wide Package Number MTD56 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. 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 device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and (c) whose failure 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 user. www.fairchildsemi.com 7 www.fairchildsemi.com 74VCX162839 Low Voltage 20-Bit Selectable Register/Buffer with 3.6V Tolerant Inputs/Outputs and 26Ω Series Resistors in the Outputs Physical Dimensions inches (millimeters) unless otherwise noted