74LVX3245M ,OCTAL DUAL SUPPLY BUS TRANSCEIVERAbsolute Maximum Ratings are those values beyond which damage to the device may occur. Functional o ..
74LVX3245MTC ,8-Bit Dual Supply TranslatingTransceiver with 3-STATE OutputsFeaturesThe LVX3245 is a dual-supply, 8-bit translating transceiver
74LVX3245M
OCTAL DUAL SUPPLY BUS TRANSCEIVER
1/10July 2001 HIGH SPEED :
tPD = 8ns (MAX.) at TA=25°C
VCCA = 3.3V VCCB = 5.0V LOW POWER DISSIPATION:
ICCA = ICCB = 5μA(MAX.) at TA=25°C LOW NOISE: VOLP =0.3V (TYP.) at VCC =3.3V SYMMETRICAL OUTPUT IMPEDANCE:OH| = IOL = 24mA (MIN) BALANCED PROPAGATION DELAYS:PLH ≅ tPHL OPERATING VOLTAGE RANGE:CCA (OPR) = 2.7V to 3.6V (1.2V Data Retention)
VCCB(OPR) = 4.5V to 5.5V (1.2V Data Retention)
PIN AND FUNCTION COMPATIBLE WITH
74 SERIES 3245 IMPROVED LATCH-UP IMMUNITY
DESCRIPTIONThe 74LVX3245 is a dual supply low voltage
CMOS OCTAL BUS TRANSCEIVER fabricated
with sub-micron silicon gate and double-layer
metal wiring C2 MOS technology. Designed for use
as an interface between a 5V bus and a 3.3V bus
in a mixed 5V/3.3V supply systems, it achieves
high speed operation while maintaining the CMOS
low power dissipation.
This IC is intended for two-way asynchronous
communication between data buses and the
direction of data transmission is determined by
DIR input. The enable input G can be used to
disable the device so that the buses are effectively
isolated.
The A-port interfaces with the 3V bus, the B-port
with the 5V bus.
All inputs are equipped with protection circuits
against static discharge, giving them 2KV ESD
immunity and transient excess voltage.
74LVX3245 OCTAL DUAL SUPPLY BUS TRANSCEIVER
PIN CONNECTION AND IEC LOGIC SYMBOLS
ORDER CODES
74LVX32452/10
INPUT AND OUTPUT EQUIVALENT CIRCUIT PIN DESCRIPTION
TRUTH TABLE X : Don’t Care
Z : High Impedance
ABSOLUTE MAXIMUM RATINGS Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is
not implied
74LVX32453/10
RECOMMENDED OPERATING CONDITIONS 1) VIN from 30% to 70% of VCC
2) VCCA = 2.7 to 3.6V; VCCB = 4.5 to 5.5V;
DC SPECIFICATIONS FOR VCCA
74LVX32454/10
DC SPECIFICATIONS FOR VCCB
DINAMIC SWITCHING CHARACTERISTICS 1) Worst case package
2) Max number of output defined as (n). Data inputs are driven 0V to 3.3V, (n-1) outputs switching and one output at GND
3) Max number of data inputs (n) switching. (n-1) switching 0V to 3.3V. Inputs under test switching: 3V to threshold (VILD). 0V to threshold
(VIHD) f = 1MHz
74LVX32455/10
AC ELECTRICAL CHARACTERISTICS (CL = 50pF, Input tr = tf = 3ns)
1) Skew is defined as the absolute value of the difference between the actual propagation delay for any two outputs of the same device switch-
ing in the same direction, either HIGH or LOW
2) Parameter guaranteed by design
3) Typical values at VCCA = 3.3V, VCCB = 5.0V
(*) Voltage range is 3.0V ± 0.3V
74LVX32456/10
CAPACITIVE CHARACTERISTICS 1) CPD is defined as the value of the IC’s internal equivalent capacitance which is calculated from the operating current consumption without
load. (Refer to Test Circuit). Average current can be obtained by the following equation. ICC(opr) = CPD x VCC x fIN + ICC/8 (per circuit)
TEST CIRCUIT CL = 50pF or equivalent (includes jig and probe capacitance)
RL = R1 = 500Ω or equivalent
RT = ZOUT of pulse generator (typically 50Ω)
