hef40374b NXP Semiconductors, hef40374b Datasheet - Page 2

• Manufacturer Part Number: hef40374b
• Description: Octal D-type Flip-flop With 3-state Outputs
• Manufacturer: NXP Semiconductors

Philips Semiconductors
DESCRIPTION
The HEF40374B is an octal D-type flip-flop with 3-state
buffered outputs with a common clock input (CP). The
device is used primarily as an 8-bit positive edge-triggered
storage register for interfacing with a 3-state bus. Data on
the D-inputs is transferred to storage during the
LOW-to-HIGH transition of the clock (CP) input. The
3-state output buffers are controlled by an active LOW
output enable input (EO). A HIGH on EO forces the eight
outputs to a high impedance OFF-state. When EO is
LOW, the data in the register appears at the outputs.
January 1995
HEF40374BP(N): 20-lead DIL; plastic (SOT146-1)
HEF40374BD(F): 20-lead DIL; ceramic (cerdip)
HEF40374BT(D): 20-lead SO; plastic (SOT163-1)
( ): Package Designator North America
Octal D-type flip-flop with 3-state outputs
Fig.1 Functional diagram.
(SOT152)
2
The output stages have high current output capability
suitable for driving highly capacitive loads.
The device features hysteresis on the CP input to improve
noise rejection.
Schmitt-trigger action in the E input makes the circuit
highly tolerant to slower input rise and fall times.
The HEF40374B is pin and functionally compatible with
the TTL ‘374’ device.
Supply voltage range: 3 to 15 V.
PINNING
FAMILY DATA, I
See Family Specifications
D
CP
EO
O
0
0
to D
to O
7
7
data inputs
clock input
output enable input (active LOW)
3-state buffered outputs
DD
Fig.2 Pinning diagram.
LIMITS category MSI
Product specification
HEF40374B
MSI