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| AT16245 Features * * * * * * * Fastest Propagation Speeds in the Industry TPD (F grade) = 2.5 ns, TPD (G grade) = 2.0 ns Maximum Derating for Capacitive Loads 1.5ns/100pF (F grade) and 1.1ns/100pF (G grade) Very Low Ground Bounce <0.6V @ VCC=5.00 V, Ta=25C Excellent Noise Rejection Typical Output Skew 0.25ns TM Bus Hold Circuitry to Retain Last Active State During Tri-StateTM Available in SSOP and TSSOP Packages Description Atmel's new family of high speed CMOS transceivers offers the best of all worlds to the user requiring stability and ultra fast speeds. These transceivers, which can function as two 8-bit devices or one 16-bit device, are capable of improving processing efficiency as much as 6% by reducing the number of wait states required during memory access. In addition, this family of parts has been designed to minimize ground bounce on the outputs while rejecting input spikes of up to 1.8V and 1 ns wide. This combination of ultra high speed and low noise is the next step in high speed performance. AT16245 Fast LogicTM Bi-Directional Transceiver AT16245F AT16245G Functional Block Diagram Pin Configurations Pin Names xOE xDIR xA xB SSOP/TSSOP 1DIR 1B2 1B3 VCC 1B6 1B7 2B1 GND 2B4 2B5 GND 2B8 1B1 GND 1B4 1B5 GND 1B8 2B2 2B3 VCC 2B6 2B7 2DIR 1 3 5 7 9 11 13 15 17 19 21 23 2 4 6 8 10 12 14 16 18 20 22 24 48 46 44 42 40 38 36 34 32 30 28 26 47 45 43 41 39 37 35 33 31 29 27 25 1A1 GND 1A4 1A5 GND 1A8 2A2 2A3 VCC 2A6 2A7 2OE 1OE 1A2 1A3 VCC 1A6 1A7 2A1 GND 2A4 2A5 GND 2A8 Descriptions Output Enable Input (Active Low) Direction Control Input Side A Inputs or Tri-State Outputs Side B Inputs or Tri-State Outputs Top View 0754B 5-9 Function Table Inputs xOE L L H Note: 1. X = Don't Care Outputs xDIR L H X (1) Bus B Data to Bus A Bus A Data to Bus B High Z State Absolute Maximum Ratings* Operating Temperature ........................ 0C to +70C Storage Temperature ......................-65C to +150C Voltage on any Pin with Respect to Ground................. -2.0 V to +7.0V(1) Maximum Operating Voltage..............................6.0V NOTICE:Stresses beyond those listed under "Absolute 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 beyond those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Notes: 1. Minimum voltage is -0.6V dc which may undershoot to -2.0V for pulses of less than 20 ns. Maximum output pin voltage is VCC +0.75V dc which may overshoot to +7.0V for pulses of less than 20 ns. 5.0 Volt DC Characteristics Symbol ICC V IH V IL IIH IIL IOZ V OH (1) Applicable over recommended operating range from Ta=0C to +70C, VCC=+5.0V 5% (unless otherwise noted) Parameter Quiescent Power Supply Current Input High Voltage Input Low Voltage Input High Current (I/O Pins) Input Low Current (I/O Pins) Output Leakage Current Output High Voltage F Grade only Output High Voltage G Grade only Output Low Voltage (F Grade) Output Low Voltage (G Grade) V CC=4.75 V IOH=-10 mA V CC=4.75 V IOH=-12 mA IOL=10 mA IOL =12 mA 2.7 2.7 0.55 0.55 VIN=V CC VIN= GND Test Conditions VCC=Max, VIN=3.4V 2.0 0.8 15 15 10 Min Typ 0.8 Max 1.2 Units mA V V A A A V V V V V OH (2) VOL VOL Note: 1. F grade: At VCC(max), the value of VOH(max) = 3.75V and at VCC(min), VOH(max ) = 3.25V 2. G grade: At VCC(max), the value of VOH(max) = 3.75V and at VCC(min), VOH(max ) = 3.35V 5-10 AT16245 AT16245 AC Characteristics AT16245F Symbol tPHL tPLH tPZH tPZL tPHZ tPLZ tSK(1) tPHL tPLH Note: (1) Applicable over recommended operating range from Ta=0C to +70C, VCC=5.0V 5% (unless otherwise noted) Parameter Propagation Delay Output Enable Time Output Disable Time Output Skew Propagation Delay vs Output Loading Test Conditions CL=50 pF CL=50 pF CL=50 pF CL=50 pF 1.3 Min Typ Max 2.5 6.0 6.0 0.5 1.5 Units ns ns ns ns ns/100pF 1. This parameter is guaranteed but not 100% tested. AT16245G Symbol TPHL TPLH TPZH TPZL TPHZ TPLZ T SK(1) tPHL tPLH Note: (1) Applicable over recommended operating range from Ta=0C to +70C, VCC=5.0V 5% (unless otherwise noted) Parameter Propagation Delay Output Enable Time Output Disable Time Output Skew Propagation Delay vs Output Loading Test Conditions CL=50 pF CL=50 pF CL=50 pF CL=50 pF 0.9 Min Typ Max 2.0 6.0 5.0 0.5 1.1 Units ns ns ns ns ns/100pF 1. This parameter is guaranteed but not 100% tested. Test Circuits(1,2) Switch Position Test Open Drain Disable Low Enable Low All Other Tests Switch Closed Open Definitions: CL = Load capacitance; Includes jig and probe capacitance. RT = Termination resistance; Should be equal to ZOUT of the Pulse Generator. Note: 1. Pulse Generator: Rate 1.0 MHz, tF 2.5 ns, tR 2.5 ns. 2. AC tests are done with a single bit switching, and timings need to be derated when multiple outputs are switching in the same direction simultaneously. This derating should not exceed 0.5 ns for 16 inputs switching simultaneously. 5-11 IOL Pull Down Current 160 120 IOL, mA 80 40 0 -40 Time 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0.0 -0.5 -1.0 IOL Output, V Output, V Ground Bounce for High to Low Transitions(1) 3.5 3.0 2.5 2.0 gnd - measured on output with input held constant output Supply Bounce for Low to High Transitions(2) 4.5 4 3.5 3 2.5 2 1.5 1 VOHV VOHP vcc measured on output with input held constant output Volts 1.5 1.0 0.5 0.0 VOLV VOLP Volts 0.5 0 Time -0.5 Time Typical Values Parameter VOLP VOLV VOHV VOHP Note: Value 0.4 -0.26 V CC - 0.13 V CC + 0.6 Units V V V V 1. When multiple outputs are switched at the same time, rapidly changing current on the ground and VCC paths cause a voltage to develop across the parasitic inductance of the wire bond and package pins. This occurrence is called simultaneous switching noise. Atmel's AT16245 products have minimized this phenomenon as shown on the graph. Output data is for 15 outputs switching simultaneously at a frequency of 1 MHz. The ground data is measured on the one remaining output, which is set to logic low and will reflect any device ground movement. 2. As on the graph for Ground Bounce, a similar condition occurs for low to high transitions. Output data is for 15 outputs switching simultaneously at a frequency of 1 MHz. VCC droop is measured on the one remaining output pin, which is set to a logic high. This output will reflect any movement on the device VCC. 5-12 AT16245 AT16245 Propagation Delay Waveforms Input Transition 1.5 V tPLH 1.5 V tPHL VOH Output Transition 1.5 V VOL Enable and Disable Waveforms(1) Enable Disable 3.0 V 1.5 V 0V tPZL tPLZ 3.5 V Switch Closed 1.5 V 0.3 V tPZH tPHZ 0.3 V 1.5 V Switch Open 0V Note: 1. Enable and disable waveforms are the same for both xOE and xDIR inputs. Control Input Output Switched Low VOL Output Switched High VOH 5-13 Ordering Information TPD 2.5 ns 2.0 ns Ordering Code AT16245F - 25YC AT16245F - 25XC AT16245G - 20YC AT16245G - 20XC Package 48Y 48X 48Y 48X Operation Range Commercial Commercial Package Type 48X 48Y 48 Pin, Plastic Thin Shrink Small Outline Package (TSSOP) 48 Pin, Plastic Shrink Small Outline Package (SSOP) 5-14 AT16245 |
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