Counter ICs

A Shift Register is a sequential logic device made up of a cascade of flip-flops, through which a sequence of bits are ’shifted’. These devices are commonly used to convert between serial and parallel interfaces.

How it works – basic example

In a Shift Register the output of each flip-flop is connected to the input of the next flip-flop in the cascade. With each cycle of the connected clock, the bits are ’shifted’ down the cascade by one flip-flop.

A simple analogy to understand the basic theory or operation would be to consider a glass tube with an opening both ends, and placing a ball marked ’0’ or ’1’ into one end of the tube at a regular intervals.

As each ball is placed into the tube, all the balls are ’shifted’ along by one position. The sequence in which the balls marked ’0’ and ’1’ where fed in is preserved. Also each time one ball is fed in, the ball that has been in the cascade the longest drops out. So if the tube can contain 4 balls at any one time, this could be described as a 4-bit Shift Register.

Common Types of Shift Register

• Serial-in serial-out (SISO) – In this type of Shift Register, the data input and output is serial. With each clock cycle a new bit is fed into the cascade, with the bit furthest along the cascade exiting as an output. So in a 4-bit register, the output trails the input by 4 clock cycles. This matches the simple example above, with the ball that exits the tube being the output.

• Serial-in parallel-out (SIPO) – In this configuration data is converted from serial into parallel format. As described for the SISO variant above, data is fed in serially and shifted down the cascade, the difference is that each flip-flop has an output, allowing the entire bit array to be output simultaneously as a parallel output. This may be done using a latched of buffered output.

• Parallel-in serial-out (PISO) – This variant takes a parallel input and converts into a serial output. To do this the shift register must implement a write/shift sequence. The parallel data input is (written) into each flip-flop of the array simultaneously in one clock cycle, then for the next cycles the register goes into shift mode as the bits are shifted down the flip-flop cascade, being output as serial data. The process then repeats.

• Parallel-in parallel-out (PIPO) – This type of register differs slightly from the others in that inputs and outputs of each flip-flop in the array are not interconnected. Each flip-flop takes one bit of the parallel input, stores it for a cycle, and then outputs the data simultaneously with the other flip-flops in the register, creating a parallel output that matches the input. Like the SISO type above, PIPO variants can be used to temporarily store data, or act a time delay device.

• Universal Shift Register – A configurable Shift Register that can be programmed to act as a SISO, SIPO, PISO or PIPO device, often on the fly.

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Description Price Package Type Logic Function Number of Stages Logic Family Mounting Type Counter Type Operation Mode Number of Elements Pin Count Minimum Operating Supply Voltage Maximum Operating Supply Voltage Dimensions Length Width
RS庫存編號 663-0130
製造零件編號CD74HC192E
TWD18.20
/個 (每包:5個)
單位
PDIP Counter 4 HC Through Hole Decade Down Counter, Up Counter 1 16 2 V 6 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
RS庫存編號 145-0429
製造零件編號CD74HC192E
TWD11.20
毎管:25 個
單位
PDIP Counter 4 HC Through Hole Decade Down Counter, Up Counter 1 16 2 V 6 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
RS庫存編號 526-757
製造零件編號SN74HC595D
TWD8.90
毎管:40 個
單位
SOIC Shift Register 8 HC Surface Mount - Serial to Serial/Parallel 1 16 2 V 6 V 9.9 x 3.91 x 1.58mm 9.9mm 3.91mm
RS庫存編號 121-8427
製造零件編號SN74HC595DR
TWD5.40
個 (在毎卷:2500)
單位
SOIC Shift Register 8 HC Surface Mount - Serial to Serial/Parallel 1 16 2 V 6 V 9.9 x 3.91 x 1.58mm 9.9mm 3.91mm
RS庫存編號 662-7030
製造零件編號CD74HC165M96
TWD13.00
/個 (每包:10個)
單位
SOIC Shift Register 8 HC Surface Mount - Serial to Serial/Parallel 1 16 2 V 6 V 9.9 x 3.91 x 1.58mm 9.9mm 3.91mm
RS庫存編號 527-520
製造零件編號SN74HC595DR
TWD12.90
/個 (每包:25個)
單位
SOIC Shift Register 8 HC Surface Mount - Serial to Serial/Parallel 1 16 2 V 6 V 9.9 x 3.91 x 1.58mm 9.9mm 3.91mm
RS庫存編號 178-9160
製造零件編號CD74HC165M96
TWD11.90
毎管:40 個
單位
SOIC Shift Register 8 HC Surface Mount - Serial to Serial/Parallel 1 16 2 V 6 V 9.9 x 3.91 x 1.58mm 9.9mm 3.91mm
RS庫存編號 809-5829
製造零件編號SN74HC595DT
TWD19.60
/個 (每包:10個)
單位
SOIC Shift Register 8 HC Surface Mount - Serial to Serial/Parallel 1 16 2 V 6 V 10 x 4 x 1.5mm 10mm 4mm
RS庫存編號 663-0102
製造零件編號CD74HC165M
TWD19.80
/個 (每包:5個)
單位
SOIC Shift Register 8 HC Surface Mount - Serial to Serial/Parallel 1 16 2 V 6 V 9.9 x 3.91 x 1.58mm 9.9mm 3.91mm
RS庫存編號 527-445
製造零件編號CD4040BE
TWD14.00
毎管:25 個
單位
PDIP Counter, Divider 12 4000 Through Hole Binary Up Counter 1 16 3 V 18 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
RS庫存編號 663-1439
製造零件編號SN74ALS193AN
TWD69.60
/個 (每包:5個)
單位
PDIP Counter 4 ALS Through Hole Binary Down Counter, Up Counter 1 16 4.5 V 5.5 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
RS庫存編號 145-0867
製造零件編號CD74HC190E
TWD23.80
毎管:25 個
單位
PDIP Counter 4 HC Through Hole Decade Down Counter, Up Counter 1 16 2 V 6 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
RS庫存編號 145-6878
製造零件編號SN74ALS193AN
TWD63.00
毎管:25 個
單位
PDIP Counter 4 ALS Through Hole Binary Down Counter, Up Counter 1 16 4.5 V 5.5 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
RS庫存編號 663-0124
製造零件編號CD74HC190E
TWD32.40
/個 (每包:5個)
單位
PDIP Counter 4 HC Through Hole Decade Down Counter, Up Counter 1 16 2 V 6 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
RS庫存編號 178-4722
製造零件編號MC14060BDG
TWD10.20
毎管:48 個
單位
SOIC Counter, Divider 14 4000 Surface Mount Binary Up Counter 1 16 3 V 18 V 10 x 4 x 1.5mm 10mm 4mm
RS庫存編號 145-1120
製造零件編號CD74HC595DW
TWD15.60
毎管:40 個
單位
SOIC Shift Register 8 HC Surface Mount - Serial to Parallel 1 16 2 V 6 V 10.5 x 7.6 x 2.35mm 10.5mm 7.6mm
RS庫存編號 806-3191
製造零件編號MC14060BDR2G
TWD11.40
/個 (每包:25個)
單位
SOIC Counter 14 MC140 Surface Mount Binary Up Counter 1 16 3 V 18 V 10 x 4 x 1.5mm 10mm 4mm
RS庫存編號 170-3568
製造零件編號MC14060BDR2G
TWD4.90
個 (在毎卷:2500)
單位
SOIC Counter 14 MC140 Surface Mount Binary Up Counter 1 16 3 V 18 V 10 x 4 x 1.5mm 10mm 4mm
RS庫存編號 809-6286
製造零件編號CD74HC595DW
TWD19.10
/個 (每包:10個)
單位
SOIC Shift Register 8 HC Surface Mount - Serial to Parallel 1 16 2 V 6 V 10.5 x 7.6 x 2.35mm 10.5mm 7.6mm
RS庫存編號 518-9035
製造零件編號MC14060BDG
TWD12.00
單位
SOIC Counter, Divider 14 4000 Surface Mount Binary Up Counter 1 16 3 V 18 V 10 x 4 x 1.5mm 10mm 4mm