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PRELIMINARY
3.3V ABT Octal Bus Transceiver with 3-State Output
54LVTH245A
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Logic Diagram (Positive Logic)
FEATURES:
* 3.3V ABT octal bus transceiver with 3-state outputs * RAD-PAK(R) radiation hardened against natural space radiation * Total dose hardness: - >100 krad (Si), depending upon space misssion * Package: - 20 pin RAD-PAK(R) flat package - 20 pin RAD-PAK(R) DIP * Operating temperature range: -55 to 125C * Supports mixed-mode signal operation - 5V input and output voltages with 3.3V VCC * Supports unregulated battery operation down to 2.7V. * Typical VOLP (output ground bounce) < 0.8V at VCC=3.3V, TA= 25C * Latch-up performance exceeds 500mA per JEDEC standard * Supports live insertion * Bus-hold data inputs eliminate the need for external pullup resistors
DESCRIPTION:
Maxwell Technologies' 54LVTH245A 8-bit octal transceiver micro-circuit features a greater than 100 krad (Si) total dose tolerance, depending upon space mission. The 54LVTH245A is designed specifically for low voltage (3.3V) VCC operation, but with the capability to provide a TTL interface to a 5V system environment. It is designed for asynchronous communication between data buses. The device transmits data from the A bus to the B bus or from the B bus to the A bus depending upon the logic level at the direction control (DIR) input. The output enable (OE) input can be used to disable the device so the buses are effectively isolated. The 54LVTH245A active bus-hold circuitry is provided to prevent floating data inputs at a valid logic level and to eliminate the need for external pullup resistors. Maxwell Technologies' patented RAD-PAK(R) packaging technology incorporates radiation shielding in the microcircuit package. It eliminates the need for box shielding while providing the required radiation shielding for a lifetime in orbit or space mission. In a GEO orbit, RAD-PAK provides greater than 100 krad (Si) radiation dose tolerance. This product is available with screening up to Class S.
1000597
12.19.01 Rev 1
All data sheets are subject to change without notice
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(858) 503-3300 - Fax: (858) 503-3301 - www.maxwell.com
(c)2001 Maxwell Technologies All rights reserved.
PRELIMINARY
3.3V ABT Octal Bus Transceiver with 3-State Output
TABLE 1. PINOUT DESCRIPTION
PIN 1 2-9 10 11-18 19 20 SYMBOL DIR A1-A8 GND B8-B1 OE VCC DESCRIPTION DirectionControl Inputs Ground Outputs Output Enable Supply Voltage
54LVTH245A
TABLE 2. 54LVT245 ABSOLUTE MAXIMUM RATINGS 1
PARAMETER Supply Voltage Range Input Voltage Range
2
SYMBOL VCC VI VO IO IIK IOK 55C PD TA TS
MIN -0.5 -0.5 -0.5 -----55 -65
MAX 4.6 7.0 7.0 48 -50 -50 1.6 125 150
UNIT V V V mA mA mA mW C
C
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Voltage Range Applied to Any Output in the High State or Power-Off State Current Into Any Output in the High State 3 Input Clamp Current (VI < 0) Output Clamp Current (VO < 0) Maximum Power Dissipation at TA = Operating Temperature Storage Temperature Range
1. Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. 2. The input and output negative-voltage ratings may be exceeded if the input and output clamp-current ratings are observed. 3. This current flows only when the output is in the high state and VO > VCC.
TABLE 3. DELTA LIMITS
PARAMETER ICC(OL) ICC(OH) ICC(OD) VARIATION 10% of specified value in Table 5 10% of specified value in Table 5 10% of specified value in Table 5
1000597
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All data sheets are subject to change without notice
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(c)2001 Maxwell Technologies All rights reserved.
PRELIMINARY
3.3V ABT Octal Bus Transceiver with 3-State Output
54LVTH245A
TABLE 4. 54LVTH245A RECOMMENDED OPERATING CONDITIONS 1
PARAMETER Supply Voltage High-level Input Voltage Low-level Input Voltage Input Voltage High-level Output Current Low-level Output Current Input Transition Rise or Fall Rate Operating Temperature Outputs enabled SYMBOL VCC VIH VIL VI IOH IOL MIN 2.7 2.0 ------55 MAX 3.6 -0.8 5.5 -24 48 10 125 UNIT V V V V mA mA ns/V
C
t/v
TA
1. Unused control inputs must be held high or low to prevent them from floating.
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TABLE 5. 54LVTH245A ELECTRICAL CHARACTERISTICS
(VCC = 3.3V 10%, TA = -55 to +125C, UNLESS OTHERWISE SPECIFIED) PARAMETER Input Clamp Voltage High-Level Output Voltage SYMBOL VIK VOH VCC = 2.7 VCC = 2.7V to 3.6V VCC = 2.7V VCC = 3V, Low-Level Output Voltage VOL VCC = 2.7V VCC = 3V TEST CONDITIONS II = -18mA IOH = -100A IOH = -8mA IOH = -24mA IOL = 100A IOL = 24mA IOL = 16mA IOL = 32mA IOL = 48mA Input Current II VCC = 3.6V VCC = 0 or 3.6V VCC = 3.6V VI = VCC or GND VI = 5.5V VI = 5.5V VI = VCC VI = 0 Hold Current Power Up Current Power Down Current II(HOLD) VCC = 3V IOZPU IOZPD
2 2
MIN -VCC -0.2 2.4 2.0 -------A or B Ports --A or B Ports 75 -75 ---
MAX -1.2 ---0.2 0.5 0.4 0.5 0.55 1 10 20 1 -5 --100 100
UNIT V V
V
Control inputs
A
VI = 0.8V VI = 2V
A A A
VCC = 0 to 1.5V, VO = 0.5V to 3V, OE = don't care VCC = 1.5V to 0, VO = 0.5V to 3V, OE = don't care
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All data sheets are subject to change without notice
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(c)2001 Maxwell Technologies All rights reserved.
PRELIMINARY
3.3V ABT Octal Bus Transceiver with 3-State Output
PARAMETER Supply Current SYMBOL ICC VCC = 3.6V IO = 0 VI = VCC or GND Delta Supply Current Input Capacitance Input Output Capacitance VCC or GND TEST CONDITIONS Outputs high Outputs low
54LVTH245A
MIN ------MAX 0.39 14 0.39 0.2 8 15 mA pF pF UNIT mA
TABLE 5. 54LVTH245A ELECTRICAL CHARACTERISTICS
(VCC = 3.3V 10%, TA = -55 to +125C, UNLESS OTHERWISE SPECIFIED)
Outputs disabled
ICC 1 VCC = 3V to 3.6V, One input at VCC -0.6V, Other inputs at
CI2 CO 2 VI = 3V or 0 VO = 3V or 0
1. This is the increase in supply current for each input that is at the specified TTL voltage level rather than VCC or GND. 2. Guaranteed by design.
TABLE 6. 54LVTH245A AC ELECTRICAL CHARACTERISTICS
(VCC = 3.3V 10%, TA = -55 RO 125C, UNLESS OTHERWISE NOTED) PARAMETER Propagation Delay Time A orB to B or A Output Enable Time OE to A or B Output Disable Time OE to A or B SYMBOL VCC = 3.3V 0.3V MIN tPLH tPHL tPZH tPZL tPHZ tPLZ 0.7 0.7 1.2 1.6 1.8 1.8 MAX 3.7 3.7 5.7 5.7 6.2 5.3 MIN ------VCC = 2.7V MAX 4.2 4.2 7.4 6.8 6.8 5.5 ns ns ns UNIT
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TABLE 7. FUNCTION TABLE
INPUTS OE L l H DIR L H X B data to A bus A data to B bus Isolation OPERATION
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All data sheets are subject to change without notice
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(c)2001 Maxwell Technologies All rights reserved.
PRELIMINARY
3.3V ABT Octal Bus Transceiver with 3-State Output
FIGURE 1. LOAD CIRCUIT
54LVTH245A
Figure Note: 1. CL includes probe and jig capacitance.
PARAMETER MEASUREMENT INFORMATION
TEST tPLH/tPHL tPLZ/tPZL tPHZ/tPZH S1 Open 6V
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GND
FIGURE 2. PULSE DURATION
FIGURE 3. SETUP AND HOLD TIMES
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(c)2001 Maxwell Technologies All rights reserved.
PRELIMINARY
3.3V ABT Octal Bus Transceiver with 3-State Output
54LVTH245A
FIGURE 4. PROPAGATION DELAY TIMES INVERTING AND NONINVERTING OUTPUTS
FIGURE 5. ENABLE AND DISABLE TIMES LOW- AND HIGH-LEVEL ENABLING
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Figure Note: 2. Waveform 1 is for an output with internal conditions such that the output is low except when disabled by The output control. Waveform 2 is for an output with internal conditions such that the output is high except when disabled by the output control.
1000597
12.19.01 Rev 1
All data sheets are subject to change without notice
6
(c)2001 Maxwell Technologies All rights reserved.
PRELIMINARY
3.3V ABT Octal Bus Transceiver with 3-State Output
54LVTH245A
Memory
20 PIN RAD-PAK(R) FLAT PACKAGE
SYMBOL MIN A b c D E E1 E2 E3 e L Q S1 N 0.370 0.035 0.005 0.128 0.015 0.003 0.470 0.287 -0.155 0.030 DIMENSION NOM 0.141 0.017 0.005 0.480 0.295 -0.160 0.068 0.050 BSC 0.380 0.039 0.007 20 0.390 0.042 -MAX 0.154 0.022 0.009 0.490 0.303 0.333 ---
F20-01 Note: All dimensions in inches
1000597
12.19.01 Rev 1
All data sheets are subject to change without notice
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(c)2001 Maxwell Technologies All rights reserved.
PRELIMINARY
3.3V ABT Octal Bus Transceiver with 3-State Output
Important Notice:
54LVTH245A
These data sheets are created using the chip manufacturer's published specifications. Maxwell Technologies verifies functionality by testing key parameters either by 100% testing, sample testing or characterization. The specifications presented within these data sheets represent the latest and most accurate information available to date. However, these specifications are subject to change without notice and Maxwell Technologies assumes no responsibility for the use of this information. Maxwell Technologies' products are not authorized for use as critical components in life support devices or systems without express written approval from Maxwell Technologies. Any claim against Maxwell Technologies must be made within 90 days from the date of shipment from Maxwell Technologies. Maxwell Technologies' liability shall be limited to replacement of defective parts.
Memory
1000597
12.19.01 Rev 1
All data sheets are subject to change without notice
8
(c)2001 Maxwell Technologies All rights reserved.
PRELIMINARY
Product Ordering Options
Model Number 54LVTH245A RP F
3.3V ABT Octal Bus Transceiver with 3-State Output
54LVTH245A
X
Feature
Option Details
Screening Flow
Monolithic S = Maxwell Class S B = Maxwell Class B E = Engineering (testing @ +25C) I = Industrial (testing @ -55C, +25C, +125C)
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Package
F = Flat Pack
Radiation Feature
RP = RAD-PAK(R) package
Base Product Nomenclature
Octal Bus Transceiver with 3State Output
1000597
12.19.01 Rev 1
All data sheets are subject to change without notice
9
(c)2001 Maxwell Technologies All rights reserved.

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