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MC54/74F398 QUAD 2-PORT REGISTER
The MC54/74F398 is the logical equivalent of a quad 2-input multiplexer feeding into four edge-triggered flip-flops. A common Select input determines which of the two 4-bit words is accepted. The selected data enters the flipflops on the rising edge of the clock.
* Select Inputs from Two Data Sources * Fully Positive Edge-Triggered Operation * Both True and Complement Outputs
CONNECTION DIAGRAM (TOP VIEW)
VCC 20 Qd 19 Qd 18 I0d 17 I1d 16 I1c 15 I0c 14 Qc 13 Qc 12 CP 11
20
QUAD 2-PORT REGISTER
FASTTM SCHOTTKY TTL
J SUFFIX CERAMIC CASE 732-03
1
1 S
2 Qa
3 Qa
4 I0a
5 I1a
6 I1b
7 I0b
8 Qb
9 Qb
10 GND
20 1
N SUFFIX PLASTIC CASE 738-03
LOGIC DIAGRAM
20
I0a S I1a D CP Qa Qa
DW SUFFIX SOIC CASE 751D-03
1
ORDERING INFORMATION
MC54FXXXJ Ceramic MC74FXXXN Plastic MC74FXXXDW SOIC
I0b D I1b CP Qb Qb
LOGIC SYMBOL
I0c D I1c CP Qc Qc 1 I0d D I1d CP Qd Qd 11 S CP I0a I1a I0b I1b I0c I1c I0d I1d 4 5 7 6 14 15 17 16
Qa Qa Qb Qb Qc Qc Qd Qd 2 3 9 8 12 13 19 18
CP
NOTES: This diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays.
VCC = PIN 20 GND = PIN 10
FAST AND LS TTL DATA 4-189
MC54/74F398
FUNCTIONAL DESCRIPTION The MC54/74F398 is a high-speed quad 2-port register. It will select four bits of data from either of two sources (Ports) under control of a common Select input (S). The selected data is transferred to a 4-bit output register synchronous with the LOW-to-HIGH transition of the Clock input (CP). The 4-bit DFUNCTION TABLE
Inputs S I I h h I0 I h X X I1 X X I h Outputs Q L H L H Q H L H L
type output register is fully edge-triggered. The Data inputs (I0x, I1x) and Select input (S) must be stable only a setup time prior to and hold time after the LOW-to-HIGH transition of the Clock input for predictable operation. The MC54/74F398 has both Q and Q outputs.
H = HIGH Voltage Level L = LOW Voltage Level h = HIGH Voltage Level one setup time prior to the LOW-to-HIGH clock transition I = LOW Voltage Level; one setup time prior to the LOW-to-HIGH clock transition X = Don't Care
GUARANTEED OPERATING RANGES
Symbol VCC TA Supply Voltage Operating Ambient Temperature Range Parameter 54, 74 54 74 IOH IOL Output Current - High Output Current - Low 54, 74 54, 74 Min 4.5 -55 0 Typ 5.0 25 25 Max 5.5 125 70 -1.0 20 mA mA Unit V C
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
Limits Symbol VIH VIL VIK VOH Parameter Input HIGH Voltage Input LOW Voltage Input Clamp Diode Voltage Output HIGH Voltage 54, 74 74 VOL IIH Output LOW Voltage Input HIGH Current 2.5 2.7 3.4 3.4 0.35 0.5 20 100 IIL IOS ICC Input LOW Current Output Short Circuit Current (Note 2) Power Supply Current -60 25 -0.6 -150 38 Min 2.0 0.8 -1.2 Typ Max Unit V V V V V V A A mA mA mA Test Conditions Guaranteed Input HIGH Voltage Guaranteed Input LOW Voltage IIN = -18 mA IOH = - 1.0 mA IOH = - 1.0 mA IOL = 20 mA VIN = 2.7 V VIN = 7.0 V VIN = 0.5 V VOUT = 0 V VCC = MAX VCC = MAX VCC = MAX VIN = GND CP = VCC = MIN VCC = 4.5 V VCC = 4.75 V VCC = MIN VCC = MAX
NOTES: 1. For conditions shown as MIN or MAX, use the appropriate value specified under guaranteed operating ranges. 2. Not more than one output should be shorted at a time, nor for more than 1 second.
FAST AND LS TTL DATA 4-190
MC54/74F398
AC CHARACTERISTICS
54/74F TA = + 25C VCC = +5.0 V CL = 50 pF Symbol fmax tPLH tPHL Parameter Maximum Clock Frequency Propagation Delay CP to Q or Q Min 100 3.0 3.0 Typ 140 5.7 6.8 7.5 9.5 Max 54F TA = -55C to +125C VCC = 5.0 V 10% CL = 50 pF Min 80 3.0 3.0 9.5 11.5 Max 74F TA = -0C to 70C VCC = 5.0 V 10% CL = 50 pF Min 100 3.0 3.0 8.5 10.0 Max Unit MHz ns
AC OPERATING REQUIREMENTS
54/74F TA = +25C VCC = +5.0V Symbol ts(H) ts(L) th(H) th(L) ts(H) ts(L) th(H) th(L) tw(H) tw(L) Parameter Setup Time, HIGH or LOW In to CP Hold Time, HIGH or LOW In to CP Setup Time, HIGH or LOW S to CP Hold Time, HIGH or LOW S to CP CP Pulse Width HIGH or LOW Min 3.0 3.0 1.0 1.0 7.5 7.5 0 0 4.0 5.0 Typ Max 54F TA = -55C to +125C VCC = 5.0 V 10% Min 4.5 4.5 1.5 1.5 10.5 10.5 0 0 4.0 7.0 Max 74F TA = -0C to 70C VCC = 5.0 V 10% Min 3.0 3.0 1.0 1.0 8.5 8.5 0 0 4.0 5.0 ns ns ns ns Max Unit ns
FAST AND LS TTL DATA 4-191

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