Revised July 2000 74VCX16838 Low Voltage 16-Bit Selectable Register/Buffer with 3.6V Tolerant Inputs and Outputs General Description Features The VCX16838 contains sixteen 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 (CP) signals. The device operates in a 16-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 74VCX16838 is designed for low voltage (1.65V to 3.6V) VCC applications with I/O compatibility up to 3.6V. The 74VCX16838 is fabricated with an advanced CMOS technology to achieve high speed operation while maintaining low CMOS power dissipation. ■ 1.65V–3.6V VCC supply operation ■ 3.6V tolerant inputs and outputs ■ tPD (CP to On) 3.0 ns max for 3.0V to 3.6V VCC 4.0 ns max for 2.3V to 2.7V VCC 8.0 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) ±24 mA @ 3.0V VCC ±18 mA @ 2.3V VCC ±6 mA @ 1.65V VCC ■ Uses patented noise/EMI reduction circuitry ■ Ideal for SDRAM DIMM modules ■ 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 74VCX16838MTD MTD48 48-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 DS500034 Description OE Output Enable Input (Active LOW) I0–I15 Inputs O0–O15 Outputs CP Clock Pulse Input REGE Register Enable Input www.fairchildsemi.com 74VCX16838 Low Voltage 16-Bit Selectable Register/Buffer with 3.6V Tolerant Inputs and Outputs July 1997 74VCX16838 Connection Diagram Truth Table Inputs Outputs CP 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 = HIGH Voltage Level L = LOW Voltage Level X = Immaterial (HIGH or LOW, inputs may not float) Z = High Impedance Functional Description The 74VCX16838 consists of sixteen selectable noninverting buffers or registers with word wide controls. Mode functionality is selected through operation of the CP and REGE pin as shown by the truth table. When REGE is held at a logic “1” the device operates as a 16-bit register. Data is transferred from In to On on the rising edge of the CP pin. When the REGE pin is held at a logic “0” the device operates in a flow through mode and data propagates directly from the I to the O outputs. All outputs can be 3-STATE by holding the OE pin at a logic “1.” 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 −50 mA Output Voltage (VO) DC Output Diode Current (IOK) Output in Active States VO < 0V −50 mA Output in “OFF” State VO > VCC +50 mA Output Current in IOH/IOL DC Output Source/Sink Current ±50 mA (IOH/IOL) Storage Temperature Range (TSTG) 0V to VCC 0.0V to 3.6V VCC = 3.0V to 3.6V ±24 mA VCC = 2.3V to 2.7V ±18 mA VCC = 1.65V to 2.3V DC VCC or GND Current per Supply Pin (ICC or GND) 1.2V to 3.6V −0.3V to +3.6V Input Voltage ±100 mA ±6 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 Max Units V 0.8 V IOH = −100 µA 2.7–3.6 VCC − 0.2 V IOH = −12 mA 2.7 2.2 V IOH = −18 mA 3.0 2.4 V IOH = −24 mA 3.0 2.2 IOL = 100 µA 2.7–3.6 0.2 V IOL = 12 mA 2.7 0.4 V IOL = 18 mA 3.0 0.4 V IOL = 24 mA 3.0 0.55 V 2.7–3.6 ±5.0 µA 2.7–3.6 ±10 µA µA II Input Leakage Current 0 ≤ VI ≤ 3.6V IOZ 3-STATE Output Leakage 0 ≤ VO ≤ 3.6V VI = V IH or VIL V IOFF Power-OFF Leakage Current 0 ≤ (VI, VO) ≤ 3.6V 0 10 ICC Quiescent Supply Current VI = V CC or GND 2.7–3.6 20 µA VCC ≤ (VI, VO) ≤ 3.6V (Note 5) 2.7–3.6 ±20 µA VIH = VCC −0.6V 2.7–3.6 750 µA ∆ICC Increase in ICC per Input Note 5: Outputs disabled or 3-STATE only. 3 www.fairchildsemi.com 74VCX16838 Absolute Maximum Ratings(Note 2) 74VCX16838 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 V 0.7 V 2.3–2.7 VCC − 0.2 V IOH = −6 mA 2.3 2.0 V IOH = −12 mA 2.3 1.8 V IOH = −18 mA 2.3 1.7 IOL = 100 µA 2.3–2.7 0.2 V IOL = 12 mA 2.3 0.4 V IOL = 18 mA 2.3 0.6 V 2.3–2.7 ±5.0 µA 2.3–2.7 ±10 µA µA II Input Leakage Current 0 ≤ VI ≤ 3.6V IOZ 3-STATE Output Leakage 0 ≤ VO ≤ 3.6V VI = VIH or VIL V IOFF Power-OFF Leakage Current 0 ≤ (VI, VO) ≤ 3.6V 0 10 ICC Quiescent Supply Current VI = VCC or GND 2.3–2.7 20 µA VCC ≤ (VI, VO) ≤ 3.6V (Note 6) 2.3–2.7 ±20 µA Max Units Note 6: Outputs disabled or 3-STATE only. DC Electrical Characteristics (1.65V ≤ VCC < 2.3V) Symbol Parameter Conditions VCC (V) Min 0.65 × VCC VIH HIGH Level Input Voltage 1.65 - 2.3 VIL LOW Level Input Voltage 1.65 - 2.3 VOH HIGH Level Output Voltage IOH = −100 µA 1.65 - 2.3 VCC − 0.2 IOH = −6 mA 1.65 1.25 1.65 - 2.3 VOL LOW Level Output Voltage IOL = 100 µA II Input Leakage Current 0 ≤ VI ≤ 3.6V IOZ 3-STATE Output Leakage 0 ≤ VO ≤ 3.6V IOL = 6 mA VI = V IH or VIL V 0.35 × V CC V V V 0.2 V 1.65 0.3 V 1.65 - 2.3 ±5.0 µA 1.65 - 2.3 ±10 µA µA IOFF Power-OFF Leakage Current 0 ≤ (VI, VO) ≤ 3.6V 0 10 ICC Quiescent Supply Current VI = V CC or GND 1.65 - 2.3 20 µA VCC ≤ (VI, VO) ≤ 3.6V (Note 7) 1.65 - 2.3 ±20 µA Note 7: Outputs disabled or 3-STATE only. www.fairchildsemi.com 4 TA = −40°C to +85°C, CL = 30 pF, RL = 500Ω Symbol Parameter VCC = 3.3V ± 0.3V Min VCC = 2.5V ± 0.2V Max Min VCC = 1.8V ± 0.15V Max Min fMAX Maximum Clock Frequency 250 tPHL, tPLH Prop Delay In to On (REGE = 0) 0.8 2.5 1.0 3.5 1.5 7.0 ns tPHL, tPLH Prop Delay CP to On (REGE = 1) 0.8 3.0 1.0 4.0 1.5 8.0 ns tPHL, tPLH Prop Delay REGE to On 0.8 3.0 1.0 4.0 1.5 8.0 ns tPZL, tPZH Output Enable Time 0.8 3.5 1.0 4.7 1.5 9.4 ns tPLZ, tPHZ Output Disable Time 0.8 3.5 1.0 3.9 1.5 7.0 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 (Note 9) tOSLH 200 Units Max 0.5 100 0.5 MHz ns 0.75 ns Note 8: For CL = 50PF, 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 CL = 50 pF Units Symbol Parameter Min Max tPHL, tPLH Prop Delay In to On (REGE = 0) 1.0 2.8 ns tPHL, tPLH Prop Delay CP to On (REGE = 1) 1.4 3.3 ns tPHL, tPLH Prop Delay REGE to On 1.0 3.3 ns tPZL, tPZH Output Enable Time 1.0 3.8 ns tPLZ, tPHZ Output Disable Time 1.0 3.8 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 0.25 2.5 0.6 3.3 0.8 1.8 −0.25 2.5 −0.6 3.3 −0.8 1.8 1.5 2.5 1.9 3.3 2.2 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 VI = 0V or VCC, f = 10 MHz, 20 pF VCC = 1.8V, 2.5V or 3.3V 5 www.fairchildsemi.com 74VCX16838 AC Electrical Characteristics (Note 8) 74VCX16838 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 2. Waveform for Inverting and Non-Inverting Functions FIGURE 3. 3-STATE Output High Enable and Disable Times for Low Voltage Logic FIGURE 4. Propagation Delay, Pulse Width and trec Waveforms FIGURE 5. Setup Time, Hold Time and Recovery Time for Low Voltage Logic 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 48-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 6.1mm Wide Package Number MTD48 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 74VCX16838 Low Voltage 16-Bit Selectable Register/Buffer with 3.6V Tolerant Inputs and Outputs Physical Dimensions inches (millimeters) unless otherwise noted