Revised August 2000 100352 Low Power 8-Bit Buffer with Cut-Off Drivers General Description Features The 100352 contains an 8-bit buffer, individual inputs (Dn), outputs (Qn), and a data output enable pin (OEN). A Q output follows its D input when the OEN pin is LOW. A HIGH on OEN holds the outputs in a cut-off state. The cut-off state is designed to be more negative than a normal ECL LOW level. This allows the output emitter-followers to turn off when the termination supply is −2.0V, presenting a high impedance to the data bus. This high impedance reduces termination power and prevents loss of low state noise margin when several loads share the bus. ■ Cut-off drivers ■ Drives 25Ω load ■ Low power operation ■ 2000V ESD protection ■ Voltage compensated operating range = −4.2V to −5.7V ■ Available to industrial grade temperature range The 100352 outputs are designed to drive a doubly terminated 50Ω transmission line (25Ω load impedance). All inputs have 50 kΩ pull-down resistors. Ordering Code: Order Number Package Number 100352PC N24E Package Description 24-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-010, 0.400 Wide 100352QC V28A 28-Lead Plastic Lead Chip Carrier (PLCC), JEDEC MO-047, 0.450 Square 100352QI V28A 28-Lead Plastic Lead Chip Carrier (PLCC), JEDEC MO-047, 0.450 Square Industrial Temperature Range (−40°C to +85°C) Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code. Logic Symbol Connection Diagrams 24-Pin DIP Pin Descriptions Pin Names 28-Pin PLCC Description D0–D7 Data Inputs OEN Output Enable Input Q0–Q7 Data Outputs NC No Connect © 2000 Fairchild Semiconductor Corporation DS010248 www.fairchildsemi.com 100352 Low Power 8-Bit Buffer with Cut-Off Drivers October 1989 100352 Truth Table Inputs Outputs Dn OEN L L L H L H X H Cutoff H = HIGH Voltage Level L = LOW Voltage Level Cutoff = Lower-than-LOW State X = Don’t Care Logic Diagram www.fairchildsemi.com 2 Qn Storage Temperature (TSTG) VEE Pin Potential to Ground Pin Recommended Operating Conditions −65°C to +150°C +150°C Maximum Junction Temperature (TJ) Case Temperature (TC) −7.0V to +0.5V −5.7V to −4.2V Supply Voltage (VEE) ≥2000V ESD (Note 2) −40°C to +85°C Industrial −100 mA Output Current (DC Output HIGH) 0°C to +85°C Commercial VEE to +0.5V Input Voltage (DC) 100352 Absolute Maximum Ratings(Note 1) Note 1: 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 rating. The “Recommended Operating Conditions” table will define the conditions for actual device operation. Note 2: ESD testing conforms to MIL-STD-883, Method 3015. Commercial Version DC Electrical Characteristics (Note 3) VEE = −4.2V to −5.7V, VCC = VCCA = GND, TC = 0°C to +85°C Min Typ Max VOH Symbol Output HIGH Voltage Parameter −1025 −955 −870 VOL Output LOW Voltage −1830 −1705 −1620 VOHC Output HIGH Voltage −1035 VOLC Output LOW Voltage −1610 VOLZ Cut-Off LOW Voltage −1950 Units mV mV mV Conditions VIN =VIH (Max) Loading with or VIL (Min) 25Ω to −2.0V VIN = VIH (Min) Loading with or VIL (Max) 25Ω to −2.0V VIN = VIH (Min) OEN = HIGH or VIL (Max) VIH Input HIGH Voltage −1165 −870 mV Guaranteed HIGH Signal VIL Input LOW Voltage −1830 −1475 mV Guaranteed LOW Signal IIL Input LOW Current 0.50 IIH Input HIGH Current IEE Power Supply Current for All Inputs for All Inputs µA µA 240 VIN = VIL (Min) VIN = VIH (Max) Inputs Open −138 −70 −143 −70 mA VEE = −4.2V to −4.8V VEE = −4.2V to −5.7V Note 3: The specified limits represent the “worst case” value for the parameter. Since these values normally occur at the temperature extremes, additional noise immunity and guardbanding can be achieved by decreasing the allowable system operating ranges. Conditions for testing shown in the tables are chosen to guarantee operation under “worst case” conditions. DIP AC Electrical Characteristics VEE = −4.2V to −5.7V, VCC = VCCA = GND Symbol Parameter TC = 0°C TC = +25°C TC = +85°C Min Max Min Max Min Max 0.70 2.00 0.70 2.00 0.70 2.20 tPLH Propagation Delay tPHL Dn to Output tPZH Propagation Delay 1.60 4.20 1.60 4.20 1.60 4.20 tPHZ OEN to Output 1.00 2.70 1.00 2.70 1.00 2.70 tTLH Transition Time tTHL 20% to 80%, 80% to 20% 0.45 2.00 0.45 2.00 0.45 2.00 Units ns ns ns Conditions Figures 1, 2 (Note 4) Figures 1, 2 (Note 4) Figures 1, 2 Note 4: The propagation delay specified is for single output switching. Delays may vary up to 300 ps with multiple outputs switching. 3 www.fairchildsemi.com 100352 Commercial Version (Continued) PLCC AC Electrical Characteristics VEE = 4.2V to −5.7V, VCC = VCCA = GND Symbol Parameter TC = 0°C TC = +25°C TC = +85°C Min Max Min Max Min Max 0.70 1.80 0.70 1.80 0.70 2.00 Units tPLH Propagation Delay tPHL Dn to Output tPZH Propagation Delay 1.60 4.00 1.60 4.00 1.60 4.00 tPHZ OEN to Output 1.00 2.50 1.00 2.50 1.00 2.50 tTLH Transition Time tTHL 20% to 80%, 80% to 20% 0.45 1.90 0.45 1.90 0.45 1.90 ns tOSHL Maximum Skew Common Edge Output-to-Output Variation ns ns Conditions Figures 1, 2 (Note 5) Figures 1, 2 (Note 5) Figures 1, 2 PLCC only 230 230 230 ps 240 240 240 ps 350 350 350 ps 350 350 350 ps (Note 6) Data to Output Path tOSLH Maximum Skew Common Edge Output-to-Output Variation PLCC only (Note 6) Data to Output Path tOST Maximum Skew Opposite Edge Output-to-Output Variation PLCC only (Note 6) Data to Output Path tPS Maximum Skew Pin (Signal) Transition Variation PLCC only (Note 6) Data to Output Path Note 5: The propagation delay specified is for single output switching. Delays may vary up to 300 ps with multiple outputs switching. Note 6: Output-to-Output Skew is defined as the absolute value of the difference between the actual propagation delay for any outputs within the same packaged device. The specifications apply to any outputs switching in the same direction either HIGH-to-LOW (tOSHL), or LOW-to-HIGH (tOSLH), or in opposite directions both HL and LH (tOST). Parameters tOST and tPS guaranteed by design. www.fairchildsemi.com 4 100352 Industrial Version PLCC DC Electrical Characteristics (Note 7) VEE = −4.2V to −5.7V, VCC = VCCA = GND, TC = −40°C to +85°C TC = −40°C Symbol Parameter Min Max TC = 0°C to +85°C Min Max VOH Output HIGH Voltage −1085 −870 −1025 −870 VOL Output LOW Voltage −1830 −1575 −1830 −1620 VOHC Output HIGH Voltage −1095 VOLC Output LOW Voltage −1565 −1610 VOLZ Cut-Off LOW Voltage −1950 −1950 −1035 Units mV mV mV Conditions VIN = VIH(Max) Loading with or VIL(Min) 25Ω to −2.0V VIN = VIH(Min) Loading with or VIL(Max) 25Ω to −2.0V VIN = VIH(Min) OEN = HIGH or VIL (Max) VIH Input HIGH Voltage −1170 −870 −1165 −870 mV Guaranteed HIGH Signal VIL Input LOW Voltage −1830 −1480 −1830 −1475 mV Guaranteed LOW Signal IIL Input LOW Current 0.50 IIH Input HIGH Current IEE Power Supply Current for All Inputs for All Inputs µA 0.50 340 240 µA VIN = VIL(Min) VIN = VIH(Max) Inputs OPEN −138 −60 −138 −70 −143 −60 −143 −70 mA VEE = −4.2V to −4.8V VEE = −4.2V to −5.7V Note 7: The specified limits represent the “worst case” value for the parameter. Since these values normally occur at the temperature extremes, additional noise immunity and guardbanding can be achieved by decreasing the allowable system operating ranges. Conditions for testing shown in the tables are chosen to guarantee operation under “worst case” conditions. PLCC AC Electrical Characteristics VEE = 4.2V to −5.7V, VCC = VCCA = GND Symbol Parameter TC = −40°C Min TC = +25°C Max Min Max TC = +85°C Min Max tPLH Propagation Delay tPHL Dn to Output 0.60 1.80 0.70 1.80 0.70 2.00 tPZH Propagation Delay 1.40 4.40 1.60 4.00 1.60 4.00 tPHZ OEN to Output 1.00 2.50 1.00 2.50 1.00 2.50 tTLH Transition Time tTHL 20% to 80%, 80% to 20% 0.40 2.50 0.45 1.90 0.45 1.90 Units ns ns ns Conditions Figures 1, 2 (Note 8) Figures 1, 2 (Note 8) Figures 1, 2 Note 8: The propagation delay specified is for single output switching. Delays may vary up to 300 ps with multiple outputs switching. 5 www.fairchildsemi.com 100352 Test Circuitry Notes: VCC, VCCA = +2V, VEE = −2.5V L1 and L2 = equal length 50Ω impedance lines RT = 50Ω terminator internal to scope Decoupling 0.1 µF from GND to VCC and VEE All unused outputs are loaded with 25Ω to GND CL = Fixture and stray capacitance ≤ 3 pF FIGURE 1. AC Test Circuit Switching Waveforms Note: The output AC measurement point for cut-off propagation delay testing = the 50% voltage point between active VOL and VOH. FIGURE 2. Propagation Delay, Cut-Off and Transition Times www.fairchildsemi.com 6 100352 Physical Dimensions inches (millimeters) unless otherwise noted 24-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-010, 0.400 Wide Package Number N24E 7 www.fairchildsemi.com 100352 Low Power 8-Bit Buffer with Cut-Off Drivers Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 28-Lead Plastic Lead Chip Carrier (PLCC), JEDEC MO-047, 0.450 Square Package Number V28A 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 www.fairchildsemi.com 8