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N74F245D
Octal transceiver (3-State)
Philips Semiconductors
Product specification 1994 Nov 15
IC15 Data Handbook
Philips Semiconductors Product specification
74F245Octal transceiver (3-State)
FEATURES Octal bidirectional bus interface 3-State buffer outputs sink 64mA 15mA source current Outputs are placed in high impedance state during power-off
conditions
DESCRIPTIONThe 74F245 is an octal transceiver featuring non-inverting 3-State
bus compatible outputs in both transmit and receive directions. The
B port outputs are capable of sinking 64mA and sourcing 15mA,
producing very good capacitive drive characteristics. The device
features an Output Enable (OE) input for easy cascading and
Transmit/Receive (T/R) input for direction control. The 3-State
outputs, B0–B7, have been designed to prevent output bus loading if
the power is removed from the device.
PIN CONFIGURATION
ORDERING INFORMATION
INPUT AND OUTPUT LOADING AND FAN-OUT TABLE
NOTE: One (1.0) FAST unit load is defined as: 20μA in the High state and 0.6mA in the Low state.
LOGIC SYMBOL
IEC/IEEE SYMBOL
Philips Semiconductors Product specification
74F245Octal transceiver (3-State)
LOGIC DIAGRAM
FUNCTION TABLEH = High voltage level
L = Low voltage level
X = Don’t care
Z = High impedance “off” state
ABSOLUTE MAXIMUM RATINGS(Operation beyond the limits set forth in this table may impair the useful life of the device.
Unless otherwise noted these limits are over the operating free-air temperature range.)
RECOMMENDED OPERATING CONDITIONS
Philips Semiconductors Product specification
74F245Octal transceiver (3-State)
DC ELECTRICAL CHARACTERISTICS(Over recommended operating free-air temperature range unless otherwise noted.)
NOTES: For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions for the applicable type. All typical values are at VCC = 5V, Tamb = 25°C. Not more than one output should be shorted at a time. For testing IOS, the use of high-speed test apparatus and/or sample-and-hold
techniques are preferable in order to minimize internal heating and more accurately reflect operational values. Otherwise, prolonged shorting
of a High output may raise the chip temperature well above normal and thereby cause invalid readings in other parameter tests. In any
sequence of parameter tests, IOS tests should be performed last.
AC ELECTRICAL CHARACTERISTICS
Philips Semiconductors Product specification
74F245Octal transceiver (3-State)
AC WAVEFORMSFor all waveforms, VM = 1.5V.
Waveform 1. Propagation Delay for Non-Inverting Output
Waveform 2. 3-State Output Enable Time to High Level and
Output Disable Time from High Level
Waveform 3. 3-State Output Enable Time to Low Level and
Output Disable Time from Low Level
TEST CIRCUIT AND WAVEFORMS
Philips Semiconductors Product specification
74F245Octal transceiver (3-State)
DIP20: plastic dual in-line package; 20 leads (300 mil) SOT146-1
